APA (7th ed.) Citation

Roberts, C. G. D., & Verbeck, F. (2010). Barbara Ladd. Project Gutenberg.

Chicago Style (17th ed.) Citation

Roberts, Charles G. D., and Frank Verbeck. Barbara Ladd. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Roberts, Charles G. D., and Frank Verbeck. Barbara Ladd. Project Gutenberg, 2010.

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