Abbas, A. and Mahmoud, M. 2019. The Effect of Using Flip Classroom On Performing Straddle and Squat Vaults In Men’s Artistic Gymnastics Vault. Journal of Physical Education. 31, 1 (Mar. 2019), 18–29. DOI:https://doi.org/10.37359/JOPE.V31(1)2019.810.