B. Shulruf and G. Wang, “Parent Influence on Outcomes for Children: HIPPY as a Cost-Effective Option”, rcis, vol. 34, pp. 7–20, Sept. 2011, Accessed: Nov. 07, 2026. Available: https://www.rcis.ro/journal/article/view/382-parent-influence-on-outcomes-for-children-hippy-as-a-cost