1. Comments on R. Ellis's "Current Issues in the Teaching of Grammar: An SLA Perspective": The Author Replies: A Balanced Perspective: Replying to Sheen
2. Krashen S.D., “Explorations in Language Acquisition and Use: The Taipei Lectures”, Heinemann, 2003
3. Larsen-Freeman D., “Teaching grammar”, Teach English as a Second or foreign Lang, 1;279–96, Jan, 2014.
4. Massia J., “EFL/ESL grammar teaching”, Crátilo Rev Estud Linguísticos e Literários, 5:215–7, 2012
5. Debata P., “The importance of grammar in English language teaching”, Lang India, 3:482–6, 2013