APA (7th ed.) Citation

Ballard, R. (2012). The Solution of the Pyramid Problem or, Pyramide Discoveries with a New Theory as to their Ancient Use. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ballard, Robert. The Solution of the Pyramid Problem or, Pyramide Discoveries with a New Theory as to Their Ancient Use. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Ballard, Robert. The Solution of the Pyramid Problem or, Pyramide Discoveries with a New Theory as to Their Ancient Use. Project Gutenberg, 2012.

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