Longman, 1989
Buku Teks
Collins, Randall, author
Random House, 1984
Buku Teks
Davis, Kingsley, 1908-1997, author
Macmillan, 1964
Buku Teks
Macionis, John J., author
Prentice-Hall, 2000
Buku Teks
Macionis, John J., author
Pearson Prentice Hall, 2000
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