Cita APA (7th ed.)

Krauskopf, K. B., & Beiser, A. (1973). The physical universe (3rd ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Krauskopf, Konrad Bates, i Arthur Beiser. The Physical Universe. 3rd ed. New York: McGraw-Hill, 1973.

Cita MLA (9th ed.)

Krauskopf, Konrad Bates, i Arthur Beiser. The Physical Universe. 3rd ed. McGraw-Hill, 1973.