Pengelley,Eric T. (1974). Sex and human life. Addison-Wesley.
Dyfyniad Arddull ChicagoPengelley,Eric T. Sex and Human Life. Massachusetts: Addison-Wesley, 1974.
Dyfyniad MLAPengelley,Eric T. Sex and Human Life. Addison-Wesley, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.