R. Rusdi, F. Dlis, J. Lubis, A. D. Nata, and W. Whalsen, “The Effect of Teaching Style Pratice, Reciprocity, Inclusion and Learning Motivation on Butterfly Swimming Skills”, J. Ilm. Pendidik. Jasm, vol. 4, no. 2, pp. 63–69, Sep. 2020.