APA (7th ed.) Citation

Black, G. D., Baxter, S., & Harte, W. B. (1973). On Walt Whitman. Folcroft Library Editions.

Chicago Style (17th ed.) Citation

Black, George D., Sylvester Baxter, and Walter Blackburn Harte. On Walt Whitman. [Folcroft, Pa.]: Folcroft Library Editions, 1973.

MLA (9th ed.) Citation

Black, George D., et al. On Walt Whitman. Folcroft Library Editions, 1973.