Syarifuddin
Current issues in second and foreign language learning and teaching
Absolute Media, 2018
 Buku Teks SO
Feedback in second language writing; contexts and issues
edited by Ken Hyland, Fiona Hyland
Cambridge University Press, 2006
 Buku Teks SO
Linking distance education technologies and the global issues syllabus: transitions to second language learning for the 21 century
 Artikel Jurnal
Cook, Vivian
Second language learning and language teaching
Edward Arnold, 2001
 Buku Teks SO
the Development of second language proficiency
Birgit Harley...[et al.], edited
Cambridge University Press, 1990
 Buku Teks SO