Analisis pengaruh electronic customer relationship management (e crm ) dengan e satisfaction sebagai variabel perantara terhadap e loyalty (studi pada campaign plus friend kakaotalk) = The influence analysis of electronic customer relationship management e crm through e satisfaction as mediating variable towards e loyalty study on kakaotalk plus friend campaign / Ramadhanu Dwi Nugraha ([Universitas Indonesia. Fakultas Ilmu Sosial dan Ilmu Politik;;;;;, ], 2014)