“ANALISIS STRATEGI DIFERENSIASI DALAM PELAYANAN BEAUTY SPA & SPA BABY TERHADAP KEUNGGULAN BERSAING DI RSIA ERIA BUNDA PEKANBARU”, kesmas, vol. 5, no. 2, pp. 25–34, Nov. 2018, Accessed: Apr. 29, 2024. [Online]. Available: https://jurnal.ikta.ac.id/kesmas/article/view/93