Columbia subject headings:
Child psychology.
Erikson, Erik H. (Erik Homburger), 1902-1994.
Piaget, Jean, 1896-1980.
Sears, Robert R. (Robert Richardson)
Harvard subject headings:
Biographies
Child psychology
Erikson, Erik H. (Erik Homburger), 1902-1994
Piaget, Jean, 1896-1980
Sears, Robert R. (Robert Richardson)
Princeton subject headings:
Child development.
Erikson, Erik H. (Erik Homburger), 1902-1994.
Piaget, Jean, 1896-1980.
Sears, Robert R. (Robert Richardson)