APA (7th ed.) Citation

Walker, A., & Bernklau. (2007). A Matter of Proportion. Project Gutenberg.

Chicago Style (17th ed.) Citation

Walker, Anne, and Bernklau. A Matter of Proportion. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Walker, Anne, and Bernklau. A Matter of Proportion. Project Gutenberg, 2007.

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