Dyfyniad APA

Alan Richards. (1998). Birds of grey: Hunters of the sky. Philadelphia, Pennsylvania: Courage Books.

Dyfyniad Arddull Chicago

Alan Richards. Birds of Grey: Hunters of the Sky. Philadelphia, Pennsylvania: Courage Books, 1998.

Dyfyniad MLA

Alan Richards. Birds of Grey: Hunters of the Sky. Philadelphia, Pennsylvania: Courage Books, 1998.

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