STUDI KOMPARATIF TENTANG KUALITAS PELAYANAN DI FAMILY FITNESS CABANG CAMBRIDGE CITY SQUARE DAN FAMILY FITNESS CABANG CENTRE POINT KOTA MEDAN. SO [Internet]. 2018 Oct. 31 [cited 2026 Aug. 11];1(2):123-31. Available from: https://jurnal.unimed.ac.id/2012/index.php/so/article/view/7788