Dyfyniad APA

(1976). Centenary of the telephone. Switzerland: ITU Telecommunication Journal.

Dyfyniad Arddull Chicago

Centenary of the Telephone. Switzerland: ITU Telecommunication Journal, 1976.

Dyfyniad MLA

Centenary of the Telephone. Switzerland: ITU Telecommunication Journal, 1976.

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