Pakistan. Directorate General of Energy Resources. Energy year book. Govt. of Pakistan, Directorate General of Energy Resources, Ministry of Petroleum & Natural Resources.
芝加哥风格引文Pakistan. Directorate General of Energy Resources. Energy Year Book. Islamabad: Govt. of Pakistan, Directorate General of Energy Resources, Ministry of Petroleum & Natural Resources.
MLA引文Pakistan. Directorate General of Energy Resources. Energy Year Book. Govt. of Pakistan, Directorate General of Energy Resources, Ministry of Petroleum & Natural Resources.
警告：这些引文格式不一定是100％准确.