Não informado. (1968). Educational Studies in Mathematics. D. Reidel Publishing.
Style de citation Chicago (17e éd.)Não informado. Educational Studies in Mathematics. Dordrecht, Holanda: D. Reidel Publishing, 1968.
Style de citation MLA (8e éd.)Não informado. Educational Studies in Mathematics. D. Reidel Publishing, 1968.
Attention : ces citations peuvent ne pas être correctes à 100%.