Nordstrom, R. J., Murray, J. E., & Clovis, A. L. (1982). Problems and materials on sales. West Pub. Co.
Lua i Stíl Chicago (17ú heag.)Nordstrom, Robert J., John Edward Murray, agus Albert L. Clovis. Problems and Materials on Sales. St. Paul, Minn: West Pub. Co, 1982.
Lua MLA (9ú heag.)Nordstrom, Robert J., et al. Problems and Materials on Sales. West Pub. Co, 1982.
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