APA

Warren R. P., . (1966). Selected poems, new and old, 1923-1966. New York: Random House.

Chicago

Warren Robert Penn, . 1966. Selected poems, new and old, 1923-1966. New York: Random House.

Harvard

Warren R. P., . (1966). Selected poems, new and old, 1923-1966. New York: Random House.

MLA

Warren Robert Penn, . Selected poems, new and old, 1923-1966. New York: Random House. 1966.