Scientific American. (1955). Twentieth-century bestiary. Simon & Schuster.
Cita Chicago (17th ed.)Scientific American. Twentieth-century Bestiary. Nueva York: Simon & Schuster, 1955.
Cita MLA (9th ed.)Scientific American. Twentieth-century Bestiary. Simon & Schuster, 1955.
Atenció: Aquestes cites poden no estar 100% correctes.