Roach, Peter (Peter John)
Cambridge University Press, 1983
Buku Teks
Rusdi Noor Rosa
Rajawali Pers, 2021
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Trask, R.L.
Routledge, 1996
Buku Referensi
Clark, John
Blackwell, 1995
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Zsiga, Elizabeth C.
West Sussex Wiley-Blackwell, 2013
Buku Teks SO