TUNGGAL SETIAWAN, Tri. STROKE RATE (SR) DAN STROKE LENGTH (SL) PERENANG GAYA BEBAS SISWA INDONESIA PESERTA POPNAS Tahun 2009. Jorpres (Jurnal Olahraga Prestasi), [S. l.], v. 11, n. 1, p. 13–22, 2016. DOI: 10.21831/jorpres.v11i1.10254. Disponível em: https://journal.uny.ac.id/index.php/jorpres/article/view/10254. Acesso em: 19 jun. 2025.