APA (7th ed.) Citation

Williams, W. C. (2011). Sour Grapes A Book of Poems. Project Gutenberg.

Chicago Style (17th ed.) Citation

Williams, William Carlos. Sour Grapes A Book of Poems. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Williams, William Carlos. Sour Grapes A Book of Poems. Project Gutenberg, 2011.

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