APA (7th ed.) Citation

Longfellow, H. W. (2013). Poems on Slavery. Project Gutenberg.

Chicago Style (17th ed.) Citation

Longfellow, Henry Wadsworth. Poems on Slavery. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Longfellow, Henry Wadsworth. Poems on Slavery. Project Gutenberg, 2013.

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