Roberts, P. C., & Stephenson, M. A. (1973). Marx's theory of exchange, alienation, and crisis. Hoover Institution Press.
Lua i Stíl Chicago (17ú heag.)Roberts, Paul Craig, agus Matthew A. Stephenson. Marx's Theory of Exchange, Alienation, and Crisis. Stanford, Calif: Hoover Institution Press, 1973.
Lua MLA (9ú heag.)Roberts, Paul Craig, agus Matthew A. Stephenson. Marx's Theory of Exchange, Alienation, and Crisis. Hoover Institution Press, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.