Dyfyniad APA

Irwin, D. B., & Simons, J. A. (1994). Lifespan developmental psychology. WCB Brown & Benchmark.

Dyfyniad Arddull Chicago

Irwin, Donald B., and Janet A. Simons. Lifespan Developmental Psychology. Madison, Wis: WCB Brown & Benchmark, 1994.

Dyfyniad MLA

Irwin, Donald B., and Janet A. Simons. Lifespan Developmental Psychology. WCB Brown & Benchmark, 1994.

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