Walters, J. M. (1986). The origins of counting in children. University Microfilms International.
Cita Chicago Style (17a ed.)Walters, Joseph M. The Origins of Counting in Children. Ann Arbor: University Microfilms International, 1986.
Cita MLA (9a ed.)Walters, Joseph M. The Origins of Counting in Children. University Microfilms International, 1986.
Precaución: Estas citas no son 100% exactas.