Calder, R. 1. (1968). Man and the cosmos: The nature of science today. Frederick A. Praeger.
Cita Chicago (17th ed.)Calder, Ritchie 1906. Man and the Cosmos: The Nature of Science Today. New York: Frederick A. Praeger, 1968.
Cita MLA (9th ed.)Calder, Ritchie 1906. Man and the Cosmos: The Nature of Science Today. Frederick A. Praeger, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.