Packard, V. O. (1962). The pyramid climbers. McGraw-Hill.
Cita Chicago Style (17a ed.)Packard, Vance Oakley. The Pyramid Climbers. New York: McGraw-Hill, 1962.
Cita MLA (9a ed.)Packard, Vance Oakley. The Pyramid Climbers. McGraw-Hill, 1962.
Precaución: Estas citas no son 100% exactas.