Dyfyniad APA
Morris, H. M. (1963). The twilight of evolution. Baker Book House.
Dyfyniad Arddull Chicago
Morris, Henry Madison. The Twilight of Evolution. Grand Rapids: Baker Book House, 1963.
Dyfyniad MLA
Morris, Henry Madison. The Twilight of Evolution. Baker Book House, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.