(1970). Square is a shape: A book about shapes / by Sharon Lerner.
Cita Chicago (17th ed.)Square Is a Shape: A Book About Shapes / by Sharon Lerner. 1970.
Cita MLA (9th ed.)Square Is a Shape: A Book About Shapes / by Sharon Lerner. 1970.
Atenció: Aquestes cites poden no estar 100% correctes.