Aprilo, I., Arfanda, P. E., Mappaompo, M. A., Asyhari, H., Hasanuddin, M. I., & Syafir, M. I. (2025). Development of Tennis Spin Serve Technique Observation Instrument: The Quality Tennis Learning in Higher Education. ETDC: Indonesian Journal of Research and Educational Review , 4(3), 509–516. https://doi.org/10.51574/ijrer.v4i3.3020