APA

Simpson G. G., . (1960). Life of the past : an introduction to paleontology. New York: Yale University.

Chicago

Simpson George Gaylord, . 1960. Life of the past : an introduction to paleontology. New York: Yale University.

Harvard

Simpson G. G., . (1960). Life of the past : an introduction to paleontology. New York: Yale University.

MLA

Simpson George Gaylord, . Life of the past : an introduction to paleontology. New York: Yale University. 1960.