Não informado. (1937). Engineering and Contract Record. Southam Business Publications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Engineering and Contract Record. Toronto, Canada: Southam Business Publications, 1937.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Engineering and Contract Record. Southam Business Publications, 1937.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.