Hartley, L. A. (1928). Human engineering and industrial economy. Printed by Marshall-Jackson Company.
Chicago-referens (17:e uppl.)Hartley, Lawrence A. Human Engineering and Industrial Economy. [Chicago: Printed by Marshall-Jackson Company, 1928.
MLA-referens (8:e uppl.)Hartley, Lawrence A. Human Engineering and Industrial Economy. Printed by Marshall-Jackson Company, 1928.
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