(1978). Steam coal. Paris: OECD.
Trích dẫn kiểu ChicagoSteam Coal. Paris: OECD, 1978.
MLA引文Steam Coal. Paris: OECD, 1978.
警告：这些引文格式不一定是100％准确.
APA引文
(1978). Steam coal. Paris: OECD.
Trích dẫn kiểu ChicagoSteam Coal. Paris: OECD, 1978.
MLA引文Steam Coal. Paris: OECD, 1978.