Puspitaningrum, P.N. and Witanto, Y. 2024. E-Module Teaching Materials Based on Heyzine Flipbook on the Meaning of NKRI for Grade IV Elementary School. Journal of Education Research and Evaluation. 8, 3 (Dec. 2024), 423–431. DOI:https://doi.org/10.23887/jere.v8i3.78326.