Não informado. (1968). Professional Engineer. National Society of Professional Engineers.
Chicagoスタイル(17版)引用形式Não informado. Professional Engineer. Jersey City, NJ: National Society of Professional Engineers, 1968.
MLA(8版)引用形式Não informado. Professional Engineer. National Society of Professional Engineers, 1968.
警告: この引用は必ずしも正確ではありません.