M.Walker Robert. (1966). The world around you. New York: A Ladder Edition.
Trích dẫn kiểu ChicagoM.Walker Robert. The World Around You. New York: A Ladder Edition, 1966.
MLA引文M.Walker Robert. The World Around You. New York: A Ladder Edition, 1966.
警告：这些引文格式不一定是100％准确.