Beard, R. M. (2006). An outline of Piaget's development psychology. Routledge.
Chicago (17e ed.) BronvermeldingBeard, Ruth M. An Outline of Piaget's Development Psychology. London: Routledge, 2006.
MLA (9e ed.) BronvermeldingBeard, Ruth M. An Outline of Piaget's Development Psychology. Routledge, 2006.
Let op: Deze citaties zijn niet altijd 100% accuraat.