Sariyati, F. et al. 2023. Development of Calistung E-Book with Flora and Fauna Character in Indonesian and Mathematics Learning Grade I Muhammadiyah Purworejo Elementary School. Jurnal Pendidikan Amartha. 1, 2 (Jan. 2023), 38–45. DOI:https://doi.org/10.57235/jpa.v1i2.87.