APA (7th ed.) Zitazioa

Warren, R. P. (1978). Now and then: Poems 1976-1978. Random House.

Chicago Style (17th ed.) Zitazioa

Warren, Robert Penn. Now and Then: Poems 1976-1978. New York: Random House, 1978.

MLA (9th ed.) Zitazioa

Warren, Robert Penn. Now and Then: Poems 1976-1978. Random House, 1978.