Johnson, K., & Herr, T. Problem Solving Strategies: Crossing the River with Dogs : And Other Mathematical Adventures (2a edición.). Key Curriculum Press.
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Cita estilo Chicago (17a ed.)
Johnson, Ken, y Ted Herr. Problem Solving Strategies: Crossing the River with Dogs : And Other Mathematical Adventures. 2a edición. Berkeley, EUA: Key Curriculum Press.
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Cita MLA (9a ed.)
Johnson, Ken, y Ted Herr. Problem Solving Strategies: Crossing the River with Dogs : And Other Mathematical Adventures. 2a edición. Key Curriculum Press.
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