Alam, B. T., H. Pramono, and R. Rumini. “Development of Multifunctional Futsal Goal Posts for Physical Education Learning in Elementary Schools, Selosari Village, Kediri Regency”. Journal of Physical Education and Sports, Vol. 8, no. 2, May 2019, pp. 187-92, https://journal.unnes.ac.id/sju/jpes/article/view/30180.