Cita APA (7a ed.)
Richmond, P. (1970). AN INTRODUCTION TO PIAGET.
Cita estilo Chicago (17a ed.)
Richmond, P.G. AN INTRODUCTION TO PIAGET. 1970.
Cita MLA (9a ed.)
Richmond, P.G. AN INTRODUCTION TO PIAGET. 1970.
Opozorilo: Ti citati niso vedno 100% točni.