Dyfyniad APA

Grolier international. (1987). Grolier academic encyclopedia: Vol :15. Grolier international, Acamedic American.

Dyfyniad Arddull Chicago

Grolier international. Grolier Academic Encyclopedia: Vol :15. USA: Grolier international, Acamedic American, 1987.

Dyfyniad MLA

Grolier international. Grolier Academic Encyclopedia: Vol :15. Grolier international, Acamedic American, 1987.

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