1. ACTFL/American Council on the Teaching of Foreign Languages (1999). ACTFL Proficiency Guidelines - Speaking, Revised 1999. Retrieved July 31, 2012, from
http://www.actfl.org
/files/public/Guidelinesspeak.pdf
2. Bachman, L. F. (1988). Problems in examining the validity of the ACTFL oral proficiency interview. Studies in Second Language Acquisition, 10: 149–164.
3. Bachman, L. F., & Savignon, S. J. (1986). The evaluation of communicative language proficiency: A critique of the ACTFL oral interview. The Modern Language Journal, 70: 380–390.
4. Brouwer, C. E., & Wagner, J. (2004). Developmental issues in second language conversation. Journal of Applied Linguistics, 1: 29–47.
5. Brown, A. (2003). Interviewer variation and the co-construction of speaking proficiency. Language Testing, 20: 1–25.