Cobb, Nancy J., author
Mayfield , 2001
Buku Teks
Cobb, Nancy J., author
Mayfield Publishing, 2000
Buku Teks
Adams, Gerald R.
Books Cole Publishing Company, 1983
Buku Teks
Rice, F. Philip, author
Pearson, 2008
Buku Teks
Santrock, John W.
mcGraw-Hill , 2005
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