White, J. Claude. Sikhim & Bhutan : twenty-one years on the north-east frontier, 1887-1908 / - London : Edward Arnold, c1909 - xix, 331 p. : ill. (1 col.) . maps ; 22 cm. Includes index. ISBN: NA LC Class. No.: 23085 Dewey Class. No.: 915.4043 / WHI