Παραπομπή APA

Lehrer, R. N. (1957). Work simplification: Creative thinking about work problems. Prentice Hall.

Παραπομπή Chicago Style

Lehrer, Robert N. Work Simplification: Creative Thinking About Work Problems. New Jersey: Prentice Hall, 1957.

Παραπομπή MLA

Lehrer, Robert N. Work Simplification: Creative Thinking About Work Problems. Prentice Hall, 1957.