GRIFFIN, Jill Yahya, Dwi Kartini Sumiharti, Yati Medya, Ratri kristiaji, Wisnu C text Jakarta Erlangga 2005 ind Judul asli : Customer logalty : how to earn it how to keep it Bibliografi : hlm. 228-235 Indeks Manajemen pergaulan - konsumen URN:ISBN:979-741-762-X