Dyfyniad APA

Postlethwait, J. H. (1995). The nature of life. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

Postlethwait, John H. The Nature of Life. New York: McGraw-Hill, 1995.

Dyfyniad MLA

Postlethwait, John H. The Nature of Life. New York: McGraw-Hill, 1995.

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