Yussen Steven R. (1998). Child development: An Introduction. Wm. C. Brown.
Dyfyniad Arddull ChicagoYussen Steven R. Child Development: An Introduction. Lowa: Wm. C. Brown, 1998.
Dyfyniad MLAYussen Steven R. Child Development: An Introduction. Wm. C. Brown, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.