Bunkarni, author
Program Pascasarjana Universitas Indonesia, 2014
UI - Tesis (Membership)
Piaget, Jean, author
Hillsdale, New Jersey Lawrence Erlbaum Associates 1991,
Buku Teks
Battaglia, Giovanni
Italia Bonacci 1995
Buku Teks
Ullidtz, Per
Elsevier, 1987
Buku Teks
Andrew Bain, author
1999
UI - Tesis (Membership)