Dyfyniad APA

Sigelman, C. K., & Shaffer, D. R. 1. (1995). Life-span human development (2nd ed.). Pacific Grove, Calif.: Brooks/Cole Pub..

Dyfyniad Arddull Chicago

Sigelman, Carol K., và David R. 1946- Shaffer. Life-span Human Development. 2nd ed. Pacific Grove, Calif.: Brooks/Cole Pub., 1995.

Dyfyniad MLA

Sigelman, Carol K., và David R. 1946- Shaffer. Life-span Human Development. 2nd ed. Pacific Grove, Calif.: Brooks/Cole Pub., 1995.

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