Ruchlis, H. (1958). Orbit: A picture story of force and motion. New York: Harper & Brothers Publishers.
Trích dẫn kiểu ChicagoRuchlis, Hyman. Orbit: A Picture Story of Force and Motion. New York: Harper & Brothers Publishers, 1958.
MLA citiranjeRuchlis, Hyman. Orbit: A Picture Story of Force and Motion. New York: Harper & Brothers Publishers, 1958.
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