Não informado. (1906). Engineering and contracting. Engineering and Contracting Publishing.
Chicago-Zitierstil (17. Ausg.)Não informado. Engineering and Contracting. Chicago, Ill: Engineering and Contracting Publishing, 1906.
MLA-Zitierstil (8. Ausg.)Não informado. Engineering and Contracting. Engineering and Contracting Publishing, 1906.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.