SPROULL ROBERT L. (1999). SCIENTIST`S TOOLS FOR BUSINESS. UNIVERSITY PRESS.
Chicago-čujuhus (17. p.)SPROULL ROBERT L. SCIENTIST`S TOOLS FOR BUSINESS. HYDERABAD: UNIVERSITY PRESS, 1999.
MLA-čujuhus (9. p.)SPROULL ROBERT L. SCIENTIST`S TOOLS FOR BUSINESS. UNIVERSITY PRESS, 1999.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.