Rungwichitsin, N., and S. Chinokul. “Effects of interleaved practice with cumulative schedule on Thai lower secondary students’ long-term retention of grammatical knowledge and their perception towards the instruction”. Kasetsart Journal of Social Sciences, vol. 43, no. 2, Apr. 2022, p. 361‒368, https://so04.tci-thaijo.org/index.php/kjss/article/view/258494.