Hasibuan, N., F. Dlis, and R. Pelana. “The Effect of Drilling Exercise Using N and V Model to Improve Forehand Clear Technique for Badminton Beginner Players”. JIPES - JOURNAL OF INDONESIAN PHYSICAL EDUCATION AND SPORT, Vol. 5, no. 02, Dec. 2019, pp. 85-90, http://103.8.12.212:33180/unj/index.php/jipes/article/view/15147.