Cita APA (7a ed.)
Heffner, R. D. A Documentary History of The United States. New American Library.
Cita estilo Chicago (17a ed.)
Heffner, Richard D. A Documentary History of The United States. Nueva York, EUA: New American Library.
Cita MLA (9a ed.)
Heffner, Richard D. A Documentary History of The United States. New American Library.
Precaución: Estas citas no son 100% exactas.