Warson, R. (1976). Commerce. Hodders & Stoughton.
Chicago-čujuhus (17. p.)Warson, Ronald. Commerce. London: Hodders & Stoughton, 1976.
MLA-čujuhus (9. p.)Warson, Ronald. Commerce. Hodders & Stoughton, 1976.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.