Tarone, Elaine
Focus on the language learner : approaches to identifying and meeting the needs of second language learners
Oxford University Press, 1991
 Buku Teks SO
Fries, Charles Carpenter
Teaching and learning english as a foreign language
University of Michigan Press, 1951
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Oskarsson, Mats
Approaches to self-assessment in foreign language learning
Pergamon Press , 1980
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Syarifuddin
Current issues in second and foreign language learning and teaching
Absolute Media, 2018
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Littlewood, William T.
Foreign and second language learning : language-acquisition research and its implications for the classroom
Cambridge University Press, 1994
 Buku Teks SO