GUNAPUTRA, WIRIYADHIKA; SUGITO, F. A.; ADHA, S. CAUSAL RELATIONSHIP BETWEEN PERCEIVED QUALITY, PRICE, AND BRAND IMAGE ON CUSTOMER LOYALTY (CASE STUDY IN PANTENE SHAMPO IN SURABAYA CITY). JURNAL EKSEKUTIF, v. 15, n. 2, p. 371-387, 7 jan. 2019.