APA (7th ed.) Citation

Bass, W. W. (2011). Adventures in the Canyons of the Colorado By two of its earliest explorers. Project Gutenberg.

Chicago Style (17th ed.) Citation

Bass, William Wallace. Adventures in the Canyons of the Colorado By Two of Its Earliest Explorers. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Bass, William Wallace. Adventures in the Canyons of the Colorado By Two of Its Earliest Explorers. Project Gutenberg, 2011.

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