1. 1) Council of Europe, “Phonological Competence,” in Common European Framework of Reference for Languages (Cambridge University Press, Cambridge, 2001), pp. 116–117.
2. 2) “Interagency Language Roundtable Language Skill Level Descriptions: Speaking,” Interagency Language Roundtable Language Skill Level Descriptions, Interagency Language Roundtable (ILR) (1985).
3. 3) “ACTFL Proficiency Guidelines — Speaking,” ACTFL Proficiency Guidelines, American Council on the Teaching of Foreign Languages (1999).
4. 4) Y. Tono, T. Kaneko, H. Isahara, T. Saiga, E. Izumi and M. Narita, “The Standard Speaking Test (SST) Corpus: A 1 million-word spoken corpus of Japanese learners of English and its implications for L2 lexicography,” Proc. Asian Association for Lexicography (ASIALEX) Biennial, pp. 7–17 (2001).
5. 5) L. F. Bachman, Fundamental Considerations in Language Testing (Oxford University Press, Oxford, 1990).