Não informado. (1920). Contractors and engineers monthly. Buttenheim-Dix Publishing.
Chicagoスタイル(17版)引用形式Não informado. Contractors and Engineers Monthly. New York: Buttenheim-Dix Publishing, 1920.
MLA(8版)引用形式Não informado. Contractors and Engineers Monthly. Buttenheim-Dix Publishing, 1920.
警告: この引用は必ずしも正確ではありません.