Style de citation APA (7e éd.)

HELMER, R. G. (1991). Time Management For Engineers And Constructors Ray G. Helmer. American Society of Civil Engi.

Style de citation Chicago (17e éd.)

HELMER, Ray Gray. Time Management For Engineers And Constructors Ray G. Helmer. American Society of Civil Engi, 1991.

Style de citation MLA (8e éd.)

HELMER, Ray Gray. Time Management For Engineers And Constructors Ray G. Helmer. American Society of Civil Engi, 1991.

Attention : ces citations peuvent ne pas être correctes à 100%.