Ayhan Aydın, Abdullah Selvitopu, Metin Kaya. Resources Invested in Education and PISA 2015 Results: A Comparative Study . Elementary Education Online [Internet]. 2023 Dec. 11 [cited 2024 Dec. 29];17(3):1283-301. Available from: https://ilkogretim-online.org./index.php/pub/article/view/746