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Drew McClellan, “Marketing Tip #75: Handwritten Notes Are Magic, Drew’s Marketing

Minute,

14/4/2010,

http://www.drewsmarketingminute.com/2010/07/marketingtip-75-

handwritten-notes-are-magic.html. Xem thêm Gene, “Wufoo Loves Their Customers,” Period
Three Blog, 13/03/2009.