Gould, R. L. (1979). Transformations: Growth and change in adult life. Simon & Schuster.
Dyfyniad Arddull ChicagoGould, Roger L. Transformations: Growth and Change in Adult Life. New York: Simon & Schuster, 1979.
Dyfyniad MLAGould, Roger L. Transformations: Growth and Change in Adult Life. Simon & Schuster, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.