Lua APA (7ú heag.)
Schiffman, S. (2002). Sales don't just happen: 26 proven strategies to increase sales in any market. Dearborn Financial Pub..
Lua i Stíl Chicago (17ú heag.)
Schiffman, Stephan. Sales Don't Just Happen: 26 Proven Strategies to Increase Sales in Any Market. Chicago, IL: Dearborn Financial Pub., 2002.
Lua MLA (9ú heag.)
Schiffman, Stephan. Sales Don't Just Happen: 26 Proven Strategies to Increase Sales in Any Market. Dearborn Financial Pub., 2002.
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