Sofiah, S., K. Kustiono, and A. Awalya. “Development of Cooperative Learning Model Assisted by Lotto Educative Media to Improve Emotional Social Early Childhood”. Journal of Primary Education, Vol. 8, no. 7, Sept. 2019, pp. 39-47, https://journal.unnes.ac.id/sju/jpe/article/view/33828.