Köhler, Wolfgang, 1887-1967, author
Liveright, 1947
Buku Teks
Joyce, Phil, author
Sage Publications , 2004
Buku Teks
Houston, Gaie, author
Sage, 2003
Buku Teks
Piaget, Jean, author
Basic Books, 1970
Buku Teks
Pascal, Gerald R.
Grune & Stratton, 1971
Buku Teks