APA (7th ed.) Citation

Webb, R. G. (2012). North American Recent Soft-shelled Turtles (Family Trionychidae). Project Gutenberg.

Chicago Style (17th ed.) Citation

Webb, Robert G. North American Recent Soft-shelled Turtles (Family Trionychidae). Project Gutenberg, 2012.

MLA (9th ed.) Citation

Webb, Robert G. North American Recent Soft-shelled Turtles (Family Trionychidae). Project Gutenberg, 2012.

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