APA (7th ed.) Citation

Gillis, C. J. (2012). Another Summer The Yellowstone Park and Alaska. Project Gutenberg.

Chicago Style (17th ed.) Citation

Gillis, Charles J. Another Summer The Yellowstone Park and Alaska. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Gillis, Charles J. Another Summer The Yellowstone Park and Alaska. Project Gutenberg, 2012.

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