Dyfyniad APA

Rural Telecom. National Telecommunications Cooperative Association.

Dyfyniad Arddull Chicago

Rural Telecom. National Telecommunications Cooperative Association.

Dyfyniad MLA

Rural Telecom. National Telecommunications Cooperative Association.

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