Cita APA (7th ed.)

Beiser, A. (1989). The earth (2nd.). Times Life Books.

Cita Chicago (17th ed.)

Beiser, Arthur. The Earth. 2nd. Hongkong: Times Life Books, 1989.

Cita MLA (9th ed.)

Beiser, Arthur. The Earth. 2nd. Times Life Books, 1989.