Novitawati, N., J. A. Wamaungu, and S. W. Astuti. “Developing Early Childhood Ability in Understanding Rules Using Combination of Role-Playing Model and Question-Answer Method Through Medium of Traffic Signs”. Journal of K6 Education and Management, Vol. 1, no. 2, Jan. 2019, pp. 11-18, doi:10.11594/jk6em.01.02.03.