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.
芝加哥风格引文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.
MLA引文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.
警告：这些引文格式不一定是100％准确.