APA (7th ed.) Citation

Simmons, W. H., & Appleton, H. A. (2007). The Handbook of Soap Manufacture. Project Gutenberg.

Chicago Style (17th ed.) Citation

Simmons, W. H., and H. A. Appleton. The Handbook of Soap Manufacture. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Simmons, W. H., and H. A. Appleton. The Handbook of Soap Manufacture. Project Gutenberg, 2007.

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