Indraswari, Candra. “Penyusunan Dan Pengembangan Alat Ukur Skala Pendek Grit”. Jurnal Spirits 10, no. 2 (May 23, 2020): 46–58. Accessed December 9, 2023. https://jurnal.ustjogja.ac.id/index.php/spirit/article/view/8211.