Arista, D., L. P. Artini, and M. Ratminingsih. “The Types of Reinforcement Strategies Used by the Teacher in Motivating EFL Students at KG B Class in Bali Kiddy School”. Journal of Psychology and Instruction, vol. 2, no. 1, Mar. 2018, pp. 9-15, doi:10.23887/jpai.v2i1.13736.