Não informado. (1930). Engineering and mining world. McGraw-Hill Publications.
Chicago-Zitierstil (17. Ausg.)Não informado. Engineering and Mining World. New York: McGraw-Hill Publications, 1930.
MLA-Zitierstil (8. Ausg.)Não informado. Engineering and Mining World. McGraw-Hill Publications, 1930.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.