Douglas, P. H. (1957). The theory of wages: [with a new foreword and the article are there laws of production?] ([Reprint.].). Kelley.
Chicago-Zitierstil (17. Ausg.)Douglas, Paul Howard. The Theory of Wages: [with a New Foreword and the Article Are There Laws of Production?]. [Reprint.]. New York, NY: Kelley, 1957.
MLA-Zitierstil (9. Ausg.)Douglas, Paul Howard. The Theory of Wages: [with a New Foreword and the Article Are There Laws of Production?]. [Reprint.]. Kelley, 1957.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.