Knapp, Brian, author
Longman House, 1992
Buku Teks
Anderson, Ralph E., author
Aldine, 1974
Buku Teks
Knapp, Brian J., author
Longman, 1992
Buku Teks
Ashford, Jose B, author
Thomson Brooks, 2006
Buku Teks
Tweedale, Jeffrey W., author
Springer, 2011
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