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Ryu, Gangseog, Feick, Lawrence. (). A Penny for your thoughts: referral reward programs and referral likelihood . : American Marketing Association.

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Ryu, Gangseog, Feick, Lawrence. A Penny for your thoughts: referral reward programs and referral likelihood. : American Marketing Association, . Text.

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Ryu, Gangseog, Feick, Lawrence. A Penny for your thoughts: referral reward programs and referral likelihood. : American Marketing Association, . Text.

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Ryu, Gangseog, Feick, Lawrence. A Penny for your thoughts: referral reward programs and referral likelihood. : American Marketing Association, . Print.