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
 Buku Teks SO
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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Ek, J. Van
Threshold level english : in a European unit/credit system for modern language learning by adults / J. van Ek and L.G. Alexander
Pergamon Press, 1975
 Buku Teks SO