APA (7th ed.) Citation

Browning, R., Browning, E. B., Eliot, G., & Shelley, P. B. (2007). O May I Join the Choir Invisible! and Other Favorite Poems. Project Gutenberg.

Chicago Style (17th ed.) Citation

Browning, Robert, Elizabeth Barrett Browning, George Eliot, and Percy Bysshe Shelley. O May I Join the Choir Invisible! and Other Favorite Poems. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Browning, Robert, et al. O May I Join the Choir Invisible! and Other Favorite Poems. Project Gutenberg, 2007.

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