APA (7th ed.) Citation

Roosevelt, T. (2010). A Book-Lover's Holidays in the Open. Project Gutenberg.

Chicago Style (17th ed.) Citation

Roosevelt, Theodore. A Book-Lover's Holidays in the Open. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Roosevelt, Theodore. A Book-Lover's Holidays in the Open. Project Gutenberg, 2010.

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