(1973). Utility gas industry in Japan 1973. Tokyo: The Japan Gas Association.
Trích dẫn kiểu ChicagoUtility Gas Industry in Japan 1973. Tokyo: The Japan Gas Association, 1973.
MLA引文Utility Gas Industry in Japan 1973. Tokyo: The Japan Gas Association, 1973.
警告:这些引文格式不一定是100%准确.