APA (7th ed.) Citation

Lalanne, M., & Koehler, S. R. (2010). A Treatise on Etching. Project Gutenberg.

Chicago Style (17th ed.) Citation

Lalanne, Maxime, and Sylvester Rosa Koehler. A Treatise on Etching. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Lalanne, Maxime, and Sylvester Rosa Koehler. A Treatise on Etching. Project Gutenberg, 2010.

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