Cita APA (7a ed.)

Gray, W. S., & Pooley, R. C. (1956). United States in literature. Scott, Foresman.

Cita Chicago Style (17a ed.)

Gray, William S., y Robert C. Pooley. United States in Literature. Chicago: Scott, Foresman, 1956.

Cita MLA (9a ed.)

Gray, William S., y Robert C. Pooley. United States in Literature. Scott, Foresman, 1956.