Cita APA (7th ed.)

Packard, L. O. (1948). Geography of the world. The Macmillan.

Cita Chicago (17th ed.)

Packard, Leonard O. Geography of the World. New York: The Macmillan, 1948.

Cita MLA (9th ed.)

Packard, Leonard O. Geography of the World. The Macmillan, 1948.