Atwood, M. E. (1979). Life before man. Fawcett Popular Library.
Cita Chicago (17th ed.)Atwood, Margaret Eleanor. Life Before Man. New York: Fawcett Popular Library, 1979.
Cita MLA (9th ed.)Atwood, Margaret Eleanor. Life Before Man. Fawcett Popular Library, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.