Cita APA

Freidel, F. B. 1., & Showman, R. K. (1974). Harvard guide to American history (revised edition.). Cambridge, Massachusetts: The Belknap Press of Harvard University Press.

Citación estilo Chicago

Freidel, Frank Burt 1916-1993, y Richard K. Showman. Harvard Guide to American History. revised edition. Cambridge, Massachusetts: The Belknap Press of Harvard University Press, 1974.

Cita MLA

Freidel, Frank Burt 1916-1993, y Richard K. Showman. Harvard Guide to American History. revised edition. Cambridge, Massachusetts: The Belknap Press of Harvard University Press, 1974.