“Comparing the Teaching Methods’ Effect (Traditional and Modern) on Problem-Solving Ability in 4 to 6 Years-Old Students of Nursery Schools in 12 Cities of Tehran Province”. Journal of Educational and Social Research 6, no. 2 (May 9, 2016): 63. Accessed July 18, 2024. https://www.richtmann.org/journal/index.php/jesr/article/view/9150.