Não informado. (1964). Coal Mining and Processing. Maclean Hunter.
Chicagoスタイル(17版)引用形式Não informado. Coal Mining and Processing. Chicago, Ill: Maclean Hunter, 1964.
MLA(8版)引用形式Não informado. Coal Mining and Processing. Maclean Hunter, 1964.
警告: この引用は必ずしも正確ではありません.