- CEFR (português) → https://www.britishcouncil.org.br/quadro-comum-europeu-de-referencia-para-linguas-cefr
- CEFR (English) → https://www.coe.int/en/web/common-european-framework-reference-languages/table-1-cefr-3.3-common-reference-levels-global-scale
- Qualitative aspects of spoken language use - Table 3 (CEFR 3.3): Common Reference levels → https://www.coe.int/en/web/common-european-framework-reference-languages/table-3-cefr-3.3-common-reference-levels-qualitative-aspects-of-spoken-language-use
- Grade para a auto-avaliação → https://rm.coe.int/CoERMPublicCommonSearchServices/DisplayDCTMContent?documentId=090000168045bb63
- Assessment grid → https://rm.coe.int/CoERMPublicCommonSearchServices/DisplayDCTMContent?documentId=090000168045bb52
