This table lists my personal collection of books. So it is surely not complete, neither is the listing in any reasonable order.
Future plans include a rating, because some books are very valuable (E.A.Vas), some are crap (Helmut Belzer).

General / Culture / Travel
Author Title Subtitle Series ISBN Year
Gisela BonnBhutanKunst und Kultur im Reich der DrachenDuMont Kunst-Reiseführer3-7701-1641-01988
Basil PaoBhutan--?2004
Martin UitzEinlass ins Reich des DonnerdrachensVerborgenes BhutanPicus Lesereisen3-85452-921-X2006
VariousBhutan And Its Natural Resources--?1997 (1991)
Britta DasKönigreich in den WolkenBhutan - Ein Jahr in der Bergwelt des HimalajaNational Geographic3-89405-136-12005 (2001)
Herbert WilhelmyBhutanLand der KlosterburgenBeck'sche Reihe3-406-33176-91990
Jamie ZeppaMein Leben in BhutanAls Frau im Land der GötterPieper Serie3-492-23663-42005 (2002)
Katie HickmanIm Tal des ZauberersInnenansichten aus Bhutan-3-8052-0468-X1990
Armin HaabBhutanFürstenstaat am Götterthron-?1969 (1961)
Heinrich HarrerDenk ich an Bhutan--3-7766-2439-62005
Tom Owen EdmundsBhutanLand Of The Thunderdragon-0-670-82535-21988
Gansser / Gansser / OlschakBhutanLand der verborgenen Schätze-?1969
Sanjay AcharyaBhutanKingdom In The Himalaya-81-7436-061-12005 (1999)
E. A. VasThe Dragon KingdomJourneys Through Bhutan-81-7062-007-41986
Ashi Dorji Wangmo WanchukTreasures Of The Thunder DragonA Portrait Of Bhutan-0-67099-901-62006
Helmut Belzer (MÜLL)BhutanEin Königreich im Himalaya-3-938466-00-62005
Stan ArmingtonBhutan-Lonely Planet1-86450-145-62002 (1998)
Armington / Whitecross / Brown / MayhewBhutan-Lonely Planet978-1-74059-529-22007 (1998)
Bart JordansBhutanA Trekkers GuideA Cicerone Guide1-85284-398-52008 (2005)
Manfred GernerBhutanKultur und Religion im Land der Drachenkönige-3-921948-05-31981
Francoise PommaretBhutan-Edition Erde Reiseführer3-86108-810-X2002
Joanny LumleyIn The Kingdom Of The Thunderdragon--0-563-38329-11997
Dr C.T. DorjiHISTORICAL DEVELOPMENT OF THE NATIONAL MUSEUM OF BHUTAN--81-86239-17-02004
Nari RustomjiBhutanThe Dragon Kingdom in Crisis-019567317-42007 (1978)
Koko SinghBhutan-Driving Holidays in the Himalayas978-81-291-1256-92007
TTK MapsA Guide To Bhutan-Discover India Series81-7053-227-22006
National Library of BhutanDriglam Namzhag - A Manual---1999
Lily WangchukFacts About Bhutan, The Land of the Thunder Dragon--99936-760-0-42008
A. C. SinhaHimalayan Kingdom BhutanTradition, Transition and Transformation-81-7387-119-12004 (2001)
Franz Binder, Winfried RodeBhutan: Königreich des Donnerdrachen--3-77749-140-32002
Claudia Meier / Stephan KöhlerDie SeeköniginMärchen aus Bhutan-3-7941-3764-71994
Martin BrauenIrgendwo in BhutanWo die Frauen (fast immer) das Sagen haben3-72940202-11994
Gyurme DorjeFootprint Bhutan190347132X2004
Kenro IzuBhutansacred within1-59005225-02007
WWF / K. TsheringBhutanManagement Effectiveness Assessment of Four Protected Areas using WWF's RAPPAM Methodology-2003
Russ And Blyth CarpenterThe Blessings Of Bhutan0-82482679-52002
Leila Merrell FosterBhutanEnchantment of the World0-51602709-31989
Matthieu RicardBhutan: Land of Serenity0-50051448-82008
Ernst Reinhardt, Ueli Rüegg, Peter Moser-KammFar apart and close togetherBhutan and Switzerland - Partners in Development since 19503-95236111-92008
 
Language
Author Title Subtitle Series ISBN Year
Dzongkha Development CommissionDzongkha Rabsel Lamzam---1990
Garab DorjiMy Picture Dictionary-WWF Bhutan99936-605-0-72000
(Karma Drupchuk)Chokye-Dzongkha-English Dictionary-Semthoka99936-632-0-32006
Dzongkha Development CommissionDzongkha-English Dictionary--99936-15-00-52002
Dzongkha Development AuthorityEnglish-Dzongkha Dictionary--? 999-663-3-52006
Dr. C. T. DorjiSaint Nagarjuna's Letter To King Gautamiputra--81-86239-11-12001
Dr. C. T. DorjiCommentary Of Manners 'Called The Tree Of Wisdom' Composed By Saint Nagarjuna--81-86239-10-32000
George van DriemLanguages of the Greater Himalayan RegionDzongkha-90-5789-002-X1998
Dr. C. T. DorjiSources Of Bhutanese History--81-86239-16-22004
John Michael ChiramalZigthrül Kuenga--99936-645-0-22002
Ugyen NimaAku Dom--99936-611-0-42002
Marie-Noelle Frei-PontKezang und Wangmo-Helvetas?<= 1982
 
Others, not solely about Bhutan
Author Title Subtitle Series ISBN Year
Willi Senft, Bert KatschnerBhutan, Ladakh, SikkimBergwandern im tibetischen Kulturkreis-3-7020-0332-01979
Manfred GernerHimalayaNepal Kaschmir Sikkim Ladakh Bhutan Nordindische TälerGoldstadt-Studienreiseführer3-87269-210-01981
Jan BoonWo der Wind betetErlebtes aus den Himalaya-Ländern Sikkim, Bhutan, Tibet, Nepal und Nordindien-3-85423-107-51992
Jan BoonNepal, Sikkim und BhutanMai's Weltführer Nr. 183-87936-067-71974
 
Still needed
Author Title Subtitle Series ISBN Year
Guy van StrydonckBhutanA Kingdom of the Eastern Himalayas090602613x1984
Peter SteeleTwo and Two Halves to Bhutan0-34012-923-91970
Harald NestroyBhutan38982328912006
Dr. C. T. DorjiAn Introduction To Bhutanese Languages?1997
Rinchhen KhanduDzongkha - English DictionaryTopic-based Approach with RomanizationASIN B000R9HMRS1998
John WehrheimBhutanHidden Lands of Happiness1-93247-632-62008
Michel PeisselZu Fuß durchs MittelalterWunderland Bhutan1971
Wilhelm Klein, Günter PfannmüllerBhutan3-89405-646-02006
J. Claude WhiteSikkim and Bhutan1-42865168-32006
Department of CultureGuide to Taktshang999366171-62005
John BertholdBhutanLand of the Thunder Dragon0-86171282-X2005
Farin UrlaubIndien & Bhutan3-89602779-42007
Indus Publishing CompanyBhutan: Society and Polity8-17387044-61996
Robert DompnierBhutan1-57062510-71999
Hans-Otto MeissnerReisen durch Nepal, Bhutan, Tibet, Sikkim und Ladakh3-570-06032-21991