Cita APA (7th ed.)

Heffner, R. D. (1956). A documentary history of the United States. The New American Library of World Literature.

Cita Chicago (17th ed.)

Heffner, Richard D. A Documentary History of the United States. Nueva York: The New American Library of World Literature, 1956.

Cita MLA (9th ed.)

Heffner, Richard D. A Documentary History of the United States. The New American Library of World Literature, 1956.