Ginsburg, Herbert.
Piaget’s theory of intellectual development: an introduction /
Herbert Ginsburg, Sylvia Opper 
. - Englewood Cliffs : Prentice-Hall, Inc.,  1969 
. - xi, 237 p.  schem.  23 cm. 
 - (The Prentice-Hall series in developmental psychology )
<br/>К.: Бібліогр. : c. v-6, Index 
<br/><label>  ISBN: </label>13-674952-6 
<br/><br/><label>Subjects--Personal Names: </label><br/>Piaget, Jean 1896-1980