Beard, Ruth M.
An Outline of Piaget's Developmental Psychology for Students and Teachers / Ruth M. Beard . - New York : New American Library , 1969 . - XIII,157 p.; 18 cm.
Piaget, Jean , 1896-1980
An Outline of Piaget's Developmental Psychology for Students and Teachers / Ruth M. Beard . - New York : New American Library , 1969 . - XIII,157 p.; 18 cm.
Piaget, Jean , 1896-1980