Dyfyniad APA

Postlethwait, J. H., & Hopson, J. L. (1992). The nature of life (2nd ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Postlethwait, John H., and Janet L. Hopson. The Nature of Life. 2nd ed. New York: McGraw-Hill, 1992.

Dyfyniad MLA

Postlethwait, John H., and Janet L. Hopson. The Nature of Life. 2nd ed. McGraw-Hill, 1992.

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