Gale, G. (1979). Theory of science. New York: Mc Graw-Hill.
Chicago Style aipamenaGale, George. Theory of Science. New York: Mc Graw-Hill, 1979.
MLA aipamenaGale, George. Theory of Science. New York: Mc Graw-Hill, 1979.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.