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