Tunggal Setiawan, Tri. 2016. “STROKE RATE (SR) AND STROKE LENGTH (SL) FREESTYLE SWIMMER INDONESIAN STUDENT PARTICIPANTS POPNAS 2009”.
Jorpres (Jurnal Olahraga Prestasi)
8 (2):36-48. https://doi.org/10.21831/jorpres.v8i2.10292.