Calder, R. (1968). Man and the cosmos: The nature of science today. F. A. Praeger.
Lua i Stíl Chicago (17ú heag.)Calder, Ritchie. Man and the Cosmos: The Nature of Science Today. New York: F. A. Praeger, 1968.
Lua MLA (9ú heag.)Calder, Ritchie. Man and the Cosmos: The Nature of Science Today. F. A. Praeger, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.