Widiastuti, Lusia, et al. “Principal Instructional Leadership in the Implementation of the ‘Wednesday Literacy Movement’ to Improve Student Literacy and Numeracy Achievement ”. Journal of Creative Power and Ambition (JCPA), vol. 4, no. 02, July 2026, pp. 203-16, https://edujavare.com/index.php/jcpa/article/view/1581.