Coba jelasin Bacaan tambahan dari Ernst Schäfer dong

Engelhardt, Isrun (ed.) "Tibet in 1938-1939: Photographs from the Ernst Schäfer Expedition to Tibet", Serinda Publications, 2007,

Bayer, Achim. 2012. The Lama Wearing Trousers: Notes on an Iron Statue in a German Private Collection. Hamburg: Zentrum für Buddhismuskunde.

National Archive of India documents relating to permissions for Tibet