Denning, Mellita, author
Dahara Prize, 2002
Buku Teks
Santrock, John W., author
Mc-Graw-Hill, 2002
Buku Teks
Santrock, John W., author
McGraw-Hill, 2006
Buku Teks
Boyd, Denise, author
Pearson , 2006
Buku Teks
Liebert, Robert M., 1942-, author
Prentice-Hall, 1986
Buku Teks