APA (7th ed.) Citation

Duffield, J. W. (2009). Bert Wilson on the Gridiron. Project Gutenberg.

Chicago Style (17th ed.) Citation

Duffield, J. W. Bert Wilson on the Gridiron. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Duffield, J. W. Bert Wilson on the Gridiron. Project Gutenberg, 2009.

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