APA (7th ed.) Citation

Bird, I. L., & Whymper, E. (2012). Among the Tibetans. Project Gutenberg.

Chicago Style (17th ed.) Citation

Bird, Isabella L., and Edward Whymper. Among the Tibetans. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Bird, Isabella L., and Edward Whymper. Among the Tibetans. Project Gutenberg, 2012.

Warning: These citations may not always be 100% accurate.