Da’i, M., and V. D. . Cahyaningrum. “The Effect of Self Efficacy and Social Support on Achievement Motivation of UNUGIRI Rugby Athletes”. Nusantara of Research : Jurnal Hasil-Hasil Penelitian Universitas Nusantara PGRI Kediri, vol. 10, no. 1, Jan. 2023, pp. 1-11, doi:10.29407/nor.v10i1.19295.