Mariyati, Lely Ika, and Vanda Rezania. “Buku Ajar Psikologi Perkembangan Manusia”. Umsida Press (November 5, 2021): 1-145. Accessed May 26, 2022. https://press.umsida.ac.id/index.php/umsidapress/article/view/978-623-6292-34-1.