Dyfyniad APA

ebrary, Inc, & Schulz, R. (2006). Encyclopedia of aging (4th ed.). Springer Pub. Co..

Dyfyniad Arddull Chicago

ebrary, Inc, and Richard Schulz. Encyclopedia of Aging. 4th ed. New York: Springer Pub. Co., 2006.

Dyfyniad MLA

ebrary, Inc, and Richard Schulz. Encyclopedia of Aging. 4th ed. Springer Pub. Co., 2006.

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