Nur Sinta, Mawar, and Nugraheti Sismulyasih SB. “Development of a Pair Check Cooperative-Based Zig-Zag Book to Improve the Writing Skills of Elementary School Students”. Journal of Integrated Elementary Education, vol. 5, no. 1, Mar. 2025, pp. 237-53, doi:10.21580/jieed.v5i1.25448.