APA (7th ed.) Citation

Wentworth, G. A. (2011). The First Steps in Algebra. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wentworth, G. A. The First Steps in Algebra. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Wentworth, G. A. The First Steps in Algebra. Project Gutenberg, 2011.

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