Cita APA (7th ed.)

Packard, L. O. (1953). Geography of the world (Rev. ed.). Macmillan.

Cita Chicago (17th ed.)

Packard, Leonard Oscar. Geography of the World. Rev. ed. New York: Macmillan, 1953.

Cita MLA (9th ed.)

Packard, Leonard Oscar. Geography of the World. Rev. ed. Macmillan, 1953.