(1970). Square is a shape: A book about shapes / by Sharon Lerner.
Chicago-čujuhus (17. p.)Square Is a Shape: A Book About Shapes / by Sharon Lerner. 1970.
MLA-čujuhus (9. p.)Square Is a Shape: A Book About Shapes / by Sharon Lerner. 1970.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.