Conklin, William E., author
Ashgate, 1998
Buku Teks
Gray, Bennison
The Hague Mouton 1977
Buku Teks
Gray, Bennison
Mouton Publisher, 1977
Buku Teks
Alderson, Peter, author
McGraw-Hill, 1995
Buku Teks
GarcĂa-Villegas, Mauricio, author
Cambridge University Press, 2018
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