Dyfyniad APA

Simpson, G. G., & Beck, W. S. (1965). Life: An Introduction to Biology. New York: Harcourt, Brace&World.

Dyfyniad Arddull Chicago

Simpson, George Gaylord, và William S. Beck. Life: An Introduction to Biology. New York: Harcourt, Brace&World, 1965.

Dyfyniad MLA

Simpson, George Gaylord, và William S. Beck. Life: An Introduction to Biology. New York: Harcourt, Brace&World, 1965.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.