Dyfyniad APA

Santrock, J. W. (1997). Life-span development (6th ed.). Brown & Benchmark Publishers.

Dyfyniad Arddull Chicago

Santrock, John W. Life-span Development. 6th ed. Madison, WI: Brown & Benchmark Publishers, 1997.

Dyfyniad MLA

Santrock, John W. Life-span Development. 6th ed. Brown & Benchmark Publishers, 1997.

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