Language contact / Yaron Matras
Cambridge University Press, 2009
 eBooks
Saville-Troike, Muriel, 1936-
Introducing second language acquisition
Cambridge University Press, 2012
 Buku Teks SO
Saville-Troike, Muriel, 1936-
Introducing second language acquisition
Cambridge University Press, 2006
 Buku Teks SO
Larsen-Freeman, Diane
An introduction to second language acquisition research
Longman , 1992
 Buku Teks SO
Second language acquisition and its pscycho-cultural implications
 Artikel Jurnal