APA (7th ed.) Citation

Roberts, C. G. D., & Bull, C. L. (2010). The Haunters of the Silences: A Book of Animal Life. Project Gutenberg.

Chicago Style (17th ed.) Citation

Roberts, Charles G. D., and Charles Livingston Bull. The Haunters of the Silences: A Book of Animal Life. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Roberts, Charles G. D., and Charles Livingston Bull. The Haunters of the Silences: A Book of Animal Life. Project Gutenberg, 2010.

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