Não informado. (1937). Engineering and Contract Record. Southam Business Publications.
Chicago-Zitierstil (17. Ausg.)Não informado. Engineering and Contract Record. Toronto, Canada: Southam Business Publications, 1937.
MLA-Zitierstil (8. Ausg.)Não informado. Engineering and Contract Record. Southam Business Publications, 1937.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.