Cita APA (7th ed.)
Morris, H. M. (1963). The twilight of evolution. Baker Book House.
Cita Chicago (17th ed.)
Morris, Henry Madison. The Twilight of Evolution. Grand Rapids: Baker Book House, 1963.
Cita MLA (9th ed.)
Morris, Henry Madison. The Twilight of Evolution. Baker Book House, 1963.
Atenció: Aquestes cites poden no estar 100% correctes.