Shulruf, Boaz, and Grace Wang. “Parent Influence on Outcomes for Children: HIPPY As a Cost-Effective Option”. Revista de Cercetare si Interventie Sociala 34 (September 30, 2011): 7–20. Accessed November 7, 2026. https://www.rcis.ro/journal/article/view/382-parent-influence-on-outcomes-for-children-hippy-as-a-cost.