Beard, R. M. (1969). An outline of Piaget's developmental psychology, for students and teachers. Routledge and Kegan Paul.
芝加哥风格引文Beard, Ruth M. An Outline of Piaget's Developmental Psychology, for Students and Teachers. London: Routledge and Kegan Paul, 1969.
MLA引文Beard, Ruth M. An Outline of Piaget's Developmental Psychology, for Students and Teachers. Routledge and Kegan Paul, 1969.
警告：这些引文格式不一定是100％准确.