Ward, B. (1967). Elementary price theory. Free Press.
Lua i Stíl Chicago (17ú heag.)Ward, Benjamin. Elementary Price Theory. New York: Free Press, 1967.
Lua MLA (9ú heag.)Ward, Benjamin. Elementary Price Theory. Free Press, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.