Dyfyniad APA

Porterfield, J. D., & St. Pierre, R. W. (1992). Healthful aging. Dushkin Pub. Group.

Dyfyniad Arddull Chicago

Porterfield, James D., and Richard W. St. Pierre. Healthful Aging. Guilford, CT: Dushkin Pub. Group, 1992.

Dyfyniad MLA

Porterfield, James D., and Richard W. St. Pierre. Healthful Aging. Dushkin Pub. Group, 1992.

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