APA (7th ed.) Citation

Ingersoll, R. G. (2011). Walt Whitman An Address. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ingersoll, Robert Green. Walt Whitman An Address. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Ingersoll, Robert Green. Walt Whitman An Address. Project Gutenberg, 2011.

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