Papua New Guinea. Passenger Transport Control Board. (1971). Annual report. The Board.
Dyfyniad Arddull ChicagoPapua New Guinea. Passenger Transport Control Board. Annual Report. [Port Moresby]: The Board, 1971.
Dyfyniad MLAPapua New Guinea. Passenger Transport Control Board. Annual Report. The Board, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.