Rujukan

Turban E. et. Al. (2002). // Electronic commerce: A managerial perspective //. New Jersey: Prentice Hall Turban E. et. Al. (2004). // Electronic commerce: A managerial perspective //. New Jersey: Prentice Hall James E. Miles dan Chip Dolce (2006). // E-commerce //. United States: America Perdagangan Elektronik. Diperoleh pada Oktober 12, 2010 daripada []
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