Devi Anggita Putri, Nanda and , Umi Budi Rahayu S.Fis., M.Kes (2019) Efektifitas Proprioceptive Neuromuscular Facilitation (PNF) Contract Relax Terhadap Fleksibilitas Otot Hamstring. Skripsi thesis, Universitas Muhammadiyah Surakarta.