Piaget, Jean
Routledge & Kegan Paul, 1975
Buku Teks
Siegler, Robert S., author
Prentice-Hall, 1998
Buku Teks
Bryant, Peter, 1937-, author
Basic Books, 1974
Buku Teks
Niken Indah Hapsari, author
Fakultas Kedokteran Universitas Indonesia, 2019
UI - Tesis (Membership)
Pillow, Bradford H., author
Springer, 2012
eBooks