1. Elinawati, Sumpono, and A. Hermansyah. Jurnal Exacta, 10(2), 156–159 (2012).
2. M.T. Yanti, E. Kuntaro and A.R. Kurniawan, Jurnal Pendidikan Dasar, 10(1), 61–68 (2020).
3. K. Boddey and K.D. Berg, Chemistry Education Reseach and Practice. Letter 16, 212–217 (2015).
4. Djali. Psikologi Pendidikan. (Bumi Aksara, 2010)
5. D.H. Schunk., P.R. Pintrich and J.L. Meece, Educational Motivation : Theory, Reseach, and Aplication. (Pearson Meri Hall, 2008).