Harcourt, G. A. o. (1967). Economic activity. C.U.P.
Chicago-čujuhus (17. p.)Harcourt, G.C. And others. Economic Activity. Cambridge: C.U.P, 1967.
MLA-čujuhus (9. p.)Harcourt, G.C. And others. Economic Activity. C.U.P, 1967.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.