Kontribusi Kekuatan Otot dan Fleksibilitas Sendi Terhadap Waktu Tempuh Renang 50 m Gaya Crawl = Contribution of the Muscle Strength and the Joint Flexibility toward the Time Taken for Swimming 50m by Crawl Stroke - Perpustakaan UGM, i-lib ([Yogyakarta] : Universitas Gadjah Mada, 2005)