translation: Variation in performance explained by students' socio-economic status (impact of socio-economic and cultural status on PISA scores) OECD
translation: Varjazzjoni fil-prestazzjoni spjegata skont l-istatus soċjoekonomiku tal-istudenti (l-impatt tal-istatus soċjoekonomiku u kulturali fuq il-punteġġi tal-PISA) OECD