00663nam a2200217Ia 4500 CTU_100106 210402s9999 xx 000 0 und d 230000 658.8 G896 Gupta, Sunnil Managing customers as investments : The strategic value of customers in the long run Sunil Gupta, Donald R. Lehmann Upper Saddle River, N.J. Wharton School Pub. 2005 Relationship marketing,Customer relations,Marketing Management Hiếu Trung tâm Học liệu Trường Đại học Cần Thơ