AMIR, Mohammad Faizal; PRASOJO, Bayu Hari. Buku Ajar Matematika Dasar. Umsida Press, [S. l.], p. 1=197, 2021. DOI: 10.21070/2017/978-979-3401-66-9. Disponível em: https://press.umsida.ac.id/index.php/umsidapress/article/view/978-979-3401-66-9. Acesso em: 21 jun. 2025.