Παραπομπή σε μορφή APA (7η εκδ.)

Papua New Guinea. Postal and Telecommunication Services. (1980). The first 25 years: P & T's silver jubilee of service to the nation Papua New Guinea 1980. Dept. of Public Utilities.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Papua New Guinea. Postal and Telecommunication Services. The First 25 Years: P & T's Silver Jubilee of Service to the Nation Papua New Guinea 1980. [Port Moresby]: Dept. of Public Utilities, 1980.

Παραπομπή σε μορφή MLA (8th εκδ.)

Papua New Guinea. Postal and Telecommunication Services. The First 25 Years: P & T's Silver Jubilee of Service to the Nation Papua New Guinea 1980. Dept. of Public Utilities, 1980.