Hitt Espinosa, F. A., & Santos, M. (1999). Proceedings of the twenty first annual meeting: Psychology of mathematics education PME-NA XXI. ERIC.
Citace podle Chicago (17th ed.)Hitt Espinosa, Fernando Antonio, a Manuel Santos. Proceedings of the Twenty First Annual Meeting: Psychology of Mathematics Education PME-NA XXI. Columbus: ERIC, 1999.
Citace podle MLA (9th ed.)Hitt Espinosa, Fernando Antonio, a Manuel Santos. Proceedings of the Twenty First Annual Meeting: Psychology of Mathematics Education PME-NA XXI. ERIC, 1999.
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