Cita APA

Beard, R. M. (1969). An outline of Piaget's developmental psychology, for students and teachers. Routledge and Kegan Paul.

Citación estilo Chicago

Beard, Ruth M. An Outline of Piaget's Developmental Psychology, for Students and Teachers. London: Routledge and Kegan Paul, 1969.

Cita MLA

Beard, Ruth M. An Outline of Piaget's Developmental Psychology, for Students and Teachers. Routledge and Kegan Paul, 1969.