Dyfyniad APA

BPI WORLDWIDE. QUESTIONS & ANSWERS EARTH. BPI WORLDWIDE.

Dyfyniad Arddull Chicago

BPI WORLDWIDE. QUESTIONS & ANSWERS EARTH. UNITED KINGDOM: BPI WORLDWIDE.

Dyfyniad MLA

BPI WORLDWIDE. QUESTIONS & ANSWERS EARTH. BPI WORLDWIDE.

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