“ANALISIS STRATEGI DIFERENSIASI DALAM PELAYANAN BEAUTY SPA & SPA BABY TERHADAP KEUNGGULAN BERSAING DI RSIA ERIA BUNDA PEKANBARU”. Al-Tamimi Kesmas: Jurnal Ilmu Kesehatan Masyarakat (Journal of Public Health Sciences), vol. 5, no. 2, Nov. 2018, pp. 25-34, https://jurnal.ikta.ac.id/kesmas/article/view/93.