APA (7th ed.) Citation

Allingham, W., & Yeats, W. B. (2005). Sixteen Poems. Project Gutenberg.

Chicago Style (17th ed.) Citation

Allingham, William, and W. B. Yeats. Sixteen Poems. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Allingham, William, and W. B. Yeats. Sixteen Poems. Project Gutenberg, 2005.

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