Cobb, Nancy J.
Mayfield , 2001
Buku Teks
Santrock, John W.
McGraw-Hill Education, 2019
Buku Teks
Santrock, John W.
McGraw-Hil , 2005
Buku Teks
edited by Lisa J. Crockett, Ann C. Crouter
Lawrence Erlbaum Associates, 1995
Buku Teks
Santrock, John W.
mcGraw-Hill , 2005
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