Não informado. (1930). Engineering and mining world. McGraw-Hill Publications.
Chicagoスタイル(17版)引用形式Não informado. Engineering and Mining World. New York: McGraw-Hill Publications, 1930.
MLA(8版)引用形式Não informado. Engineering and Mining World. McGraw-Hill Publications, 1930.
警告: この引用は必ずしも正確ではありません.