Schiffman Stephan. (1997). 25 tabiat penjualan: Jurujual paling berjaya. Synergy Books International.
Chicago Style (17th ed.) CitationSchiffman Stephan. 25 Tabiat Penjualan: Jurujual Paling Berjaya. Kuala Lumpur: Synergy Books International, 1997.
MLA (9th ed.) CitationSchiffman Stephan. 25 Tabiat Penjualan: Jurujual Paling Berjaya. Synergy Books International, 1997.
Warning: These citations may not always be 100% accurate.