Chafe, William Henry
Oxford University Press, 1995
Buku Teks
Williamson, Bill
Oxford Basil Balckwell 1990,
Buku Teks
Spanier, John
Frederck A. Praeger, 1968
Buku Teks
Oxford University Press, 1995
Buku Teks
Yinan He, author
Cambridge University Press, 2010
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