Gerber, P. L. (1982). Robert Frost. Twayne Publishers.
Cita Chicago (17th ed.)Gerber, Philip L. Robert Frost. Boston: Twayne Publishers, 1982.
Cita MLA (9th ed.)Gerber, Philip L. Robert Frost. Twayne Publishers, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.