Cita APA

M.Walker Robert. (1966). The world around you. New York: A Ladder Edition.

Chicago Style Citation

M.Walker Robert. The World Around You. New York: A Ladder Edition, 1966.

Cita MLA

M.Walker Robert. The World Around You. New York: A Ladder Edition, 1966.

Atenció: Aquestes cites poden no estar 100% correctes.