Exam, C. (2026). English-Test International English Language Testing System PDF. Zenodo.
Citazione stile Chigago Style (17a edizione)Exam, Certification. English-Test International English Language Testing System PDF. Zenodo, 2026.
Citatione MLA (9a ed.)Exam, Certification. English-Test International English Language Testing System PDF. Zenodo, 2026.
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