1. Alonso, R. A. (2002). Current issues in language transfer. Actas del Encuentro Conmemorativo de los 25 años del Centro de Lingüística de la Universidad de Oporto, 231-236.
2. Carson, J. E. (1990). Reading-writing connections: toward a description for second language learners [A]. In Kroll, B. (ed). Second language Writing Research Insights for Classroom [C]. Cambridge University Press.
3. Cummins, J. (1983). Language proficiency and academic achievement [C]. In J. W. Oller, Jr. (ed.) Issues in language testing research [A]. Rowley, Mass.: Newbury House.
4. Dulay, H. & Burt, M. (1972). Goofing: An indicator of children’s second language learning strategies. Language Learning, 22: 2, 235-251.
5. Erarslan, A., & Hol, D. (2014). Language interference on English: Transfer on the vocabulary, tense and preposition use of freshmen Turkish EFL learners. ELTA Journal, 2(2), 4-22.