An itinerary of the route from Sikkim to Lhasa : together with a plan of the capital of Tibet and a new map of the route from Yamdok Lake to Lhasa / by Graham Sandberg. - Calcutta : At the Baptist Mission Press, 1901. - 29 S.
Das, Sarat Chandra (1849-1917) A Tibetan-English dictionary with Sanskrit synonyms / by Sarat Chandra Das. Revised and ed. under the orders of the government of Bengal by Graham Sandberg and A. William Heyde. - Calcutta : The Bengal Secretariat Book Depôt, 1902. - XXXIV, 1353 S.