APA (7th ed.) Citation

Shaler, N. S. (2006). Outlines of the Earth's History A Popular Study in Physiography. Project Gutenberg.

Chicago Style (17th ed.) Citation

Shaler, Nathaniel Southgate. Outlines of the Earth's History A Popular Study in Physiography. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Shaler, Nathaniel Southgate. Outlines of the Earth's History A Popular Study in Physiography. Project Gutenberg, 2006.

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