Hemstock, H. F., & Costelloe, P. (1969). Modern business arithmetic (3rd ed.). Nelson.
Chicago-čujuhus (17. p.)Hemstock, H. F., juo P.J Costelloe. Modern Business Arithmetic. 3rd ed. [S.l.]: Nelson, 1969.
MLA-čujuhus (9. p.)Hemstock, H. F., juo P.J Costelloe. Modern Business Arithmetic. 3rd ed. Nelson, 1969.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.