MLA

Seferis, George, and Rex Warner. Poems. [1st American ed.] Boston: Little, Brown, 1960.

APA

Seferis, G., & Warner, R. (1960). Poems. [1st American ed.] Boston: Little, Brown.

Chicago

Seferis, George, and Rex Warner. Poems. [1st American ed.] Boston: Little, Brown, 1960.