Ward, B. (1967). Elementary price theory. Free Press.
Chicago-čujuhus (17. p.)Ward, Benjamin. Elementary Price Theory. New York: Free Press, 1967.
MLA-čujuhus (9. p.)Ward, Benjamin. Elementary Price Theory. Free Press, 1967.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.