Gschwandtner, G. (2007). The psychology of sales success: Learn to think like your customer to close every sale. New York: McGraw-Hill.
Chicago-tyylinen lähdeviittausGschwandtner, Gerhard. The Psychology of Sales Success: Learn to Think Like Your Customer to Close Every Sale. New York: McGraw-Hill, 2007.
MLA-viiteGschwandtner, Gerhard. The Psychology of Sales Success: Learn to Think Like Your Customer to Close Every Sale. New York: McGraw-Hill, 2007.
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