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"Državna matura", Wikipedija (in Croatian), 6 January 2023, retrieved 6 April 2023
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The summer slide: what we know and can do about summer learning loss. Alexander, Karl L.; Pitcock, Sarah; Boulay, Matthew. New York, NY. 2016. ISBN978-0-8077-5799-4. OCLC957134420.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)