Ward, H. (1927). Charles Darwin and the theory of evolution. New Home Library.
Cita Chicago (17th ed.)Ward, Henshaw. Charles Darwin and the Theory of Evolution. New York: New Home Library, 1927.
Cita MLA (9th ed.)Ward, Henshaw. Charles Darwin and the Theory of Evolution. New Home Library, 1927.
Atenció: Aquestes cites poden no estar 100% correctes.