Sorenson, Herbert, author
McGraw-Hill, 1971
Buku Teks
Gilmer, B. von Haller (Beverly von Haller), 1909-1994, author
McGraw-Hill, 1967
Buku Teks
Duffy, Karen G., author
Pearson Education, Inc., 2005
Buku Teks
Duffy, Karen G., author
New Jersey, 2005
Buku Teks
Santrock, John W.
McGraw-Hill, 2003
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