Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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