Não informado. (1968). Professional Engineer. National Society of Professional Engineers.
Style de citation Chicago (17e éd.)Não informado. Professional Engineer. Jersey City, NJ: National Society of Professional Engineers, 1968.
Style de citation MLA (8e éd.)Não informado. Professional Engineer. National Society of Professional Engineers, 1968.
Attention : ces citations peuvent ne pas être correctes à 100%.