Day, R. L. (1968). Sales management simulation: Participant's manual. Sales and Marketing Executices-International.
Lua i Stíl Chicago (17ú heag.)Day, Ralph L. Sales Management Simulation: Participant's Manual. New York: Sales and Marketing Executices-International, 1968.
Lua MLA (9ú heag.)Day, Ralph L. Sales Management Simulation: Participant's Manual. Sales and Marketing Executices-International, 1968.
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