4Antón,M.The discourse of a learner-centered classroom:Sociocultural perspectives on teacher-learner interaction in the second language classroom. The Modern Language Journal . 1999
5Hakansson,G.Quantitative Studies of Teacher Talk. Learning,Teaching and Communication in the Foreign Language Classroom . 1986
6Nunan,D.Language Teaching Methodology. . 1991
7Krashen.S.D.Principles and Practice in Second Language Acquisition. . 1982