A. J. Elrika, R. M. Rahmadhani, and A. C. Ruby, “The Use of Flash Card Media to Improve Recognition of Numbers 1-10 in Children with Mild Mental Retardation: A Case Study at SLB N X Kudus”, Jurnal Prajaiswara, vol. 6, no. 2, pp. 628–633, Dec. 2025.