Novak, David
Developmental mathematics
D.C. Health , 1989
 Buku Teks SO
Developmental psychology
American Psychological Assosiation, 2001
 Majalah, Jurnal, Buletin
Gilbert, Scott F.
Developmental biology
Sinauer Associattes, 2000
 Buku Teks
Muller, Werner A.
Developmental biology
Springer, 1997
 Buku Teks
Gilbert, Scott F.
Developmental biology
Sinauer Associates, 1994
 Buku Teks