Dyfyniad APA

Hartley, L. A. (1928). Human engineering and industrial economy. Printed by Marshall-Jackson Company.

Dyfyniad Arddull Chicago

Hartley, Lawrence A. Human Engineering and Industrial Economy. [Chicago: Printed by Marshall-Jackson Company, 1928.

Dyfyniad MLA

Hartley, Lawrence A. Human Engineering and Industrial Economy. Printed by Marshall-Jackson Company, 1928.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.