MUHAMMAD TAQWA. Validity of Derivative Calculus Textbook to Increase Learning Motivation. Pi: Mathematics Education Journal, [S. l.], v. 6, n. 2, p. 108–114, 2023. DOI: 10.21067/pmej.v6i2.9195. Disponível em: http://ejournal.unikama.ac.id/index.php/pmej/article/view/9195. Acesso em: 22 jul. 2024.