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files.eric.ed.gov
"21st Century Skills Map"(PDF). Partnership for 21st Century Skills. ERIC. 23 Aralık 2021 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 30 Ocak 2022.
"21st Century Skills Map"(PDF). Partnership for 21st Century Skills. ERIC. 23 Aralık 2021 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 30 Ocak 2022.