Allwright, D., & Bailey, K. M. (1991). Focus on the language classroom: An introduction to classroom research for language teachers. Cambridge University Press.

Allwright, Dick, and Kathleen M. Bailey. Focus on the Language Classroom: An Introduction to Classroom Research for Language Teachers. Cambridge [England] ; New York: Cambridge University Press, 1991.

Allwright, Dick, and Kathleen M. Bailey. Focus on the Language Classroom: An Introduction to Classroom Research for Language Teachers. Cambridge University Press, 1991.