Beard, R. M. (2006). An outline of Piaget's development psychology. Routledge.
芝加哥风格引文Beard, Ruth M. An Outline of Piaget's Development Psychology. London: Routledge, 2006.
MLA引文Beard, Ruth M. An Outline of Piaget's Development Psychology. Routledge, 2006.
警告：这些引文格式不一定是100％准确.