APA (7th ed.) Citation

Hazen, E. (2012). Popular Technology, Vol. I (of 2) or, Professions and Trades. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hazen, Edward. Popular Technology, Vol. I (of 2) or, Professions and Trades. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Hazen, Edward. Popular Technology, Vol. I (of 2) or, Professions and Trades. Project Gutenberg, 2012.

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