APA (7th ed.) Citation

Schafer, R. D. (2008). An Introduction to Nonassociative Algebras. Project Gutenberg.

Chicago Style (17th ed.) Citation

Schafer, Richard D. An Introduction to Nonassociative Algebras. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Schafer, Richard D. An Introduction to Nonassociative Algebras. Project Gutenberg, 2008.

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