Colin, Virginia L
Human attachment / Virginia L. Colin
McGraw-Hill , 1996
 Buku Teks
Exploring young children concepts of self and other through conversation
edited by Linda L. Sperry and Patricia A. Smiley
Jossey-Bass, 1995
 Buku Teks
Gesell, Arnold
Child development: an introduction to the study on human growth
Harper & Row, 1949
 Buku Teks
Handbook of child psychology : volume 1, theoretical models of human development
William Damon, editor-in-chief
John Wiley & Sons, 1998
 Buku Referensi
Papalia, Diane E.
Perkembangan manusia; Buku 2 = Human development
Salemba Empat, 2009
 Buku Teks