Masruroh, N. L., H. B. Mardikantoro, and S. Sugianto. “Development of Supplementary Book of Writing Skills for Beginner With Local Wisdom Content for Elementary School Students”. Journal of Primary Education, Vol. 8, no. 9, Nov. 2019, pp. 317-25, doi:10.15294/jpe.v10i3.35356.