Wermel, M. T. (1939). The evolution of the classical wage theory. Columbia University Press.
Lua i Stíl Chicago (17ú heag.)Wermel, Michael Theodore. The Evolution of the Classical Wage Theory. New York: Columbia University Press, 1939.
Lua MLA (9ú heag.)Wermel, Michael Theodore. The Evolution of the Classical Wage Theory. Columbia University Press, 1939.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.