edited by George Mckenzie, Jackie Powell, Robin Usher
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Buku Teks
edited by Else Oyen
Sage, 1992
Buku Teks
Coppock, Vicki, author
SAGE, 2010
Buku Teks
McGraw-Hill, 1971
Buku Teks
Sjoberg, Gideon
Harper & Row Publishers, 1968
Buku Teks