edited by Barry Turner
Macmillan and The Free Press, 1992
Buku Referensi
edited by Barry Turner
Macmillan, 1992
Buku Referensi
Writer's Digest Bokks, 1994
Buku Teks
Dietsch, Betty Mattix, author
McGraw-Hill, 2003
Buku Teks
Wadsworth/Thomson Learning, 2004
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