Dyfyniad APA

(2001). Annual Editions: Human development 2001-2002 (29th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Annual Editions: Human Development 2001-2002. 29th ed. Connecticut: McGraw-Hill, 2001.

Dyfyniad MLA

Annual Editions: Human Development 2001-2002. 29th ed. McGraw-Hill, 2001.

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