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Nahak, Benediktus, Alex Pangkahila, & Susy Purnawati.
" PELATIHAN LARI INTERVAL 4 X 50 METER DI PANTAI BERPASIR LEBIH MENINGKATKAN KECEPATAN LARI 100 METER DARIPADA PELATIHAN LARI INTERVAL 4 X 50 METER DI LAPANGAN PADA SISWA KELAS XSMK N KAKULUK MESAK NTT.." <em>Sport and Fitness Journal</em> [Online], (2014): n. pag. Web.  5 Sep. 2026