Dyfyniad APA

Received from Dr. M.C. Agarwal.

Dyfyniad Arddull Chicago

Received from Dr. M.C. Agarwal.

Dyfyniad MLA

Received from Dr. M.C. Agarwal.

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