D'Angelo, J. P., & John P. D'Angelo; Douglas Brent West. (2000). Mathematical thinking: Problem-solving and proofs. Upper Saddle River, NJ: Prentice Hall.
Παραπομπή Chicago StyleD'Angelo, John P., και John P. D'Angelo; Douglas Brent West. Mathematical Thinking: Problem-solving and Proofs. Upper Saddle River, NJ: Prentice Hall, 2000.
Παραπομπή MLAD'Angelo, John P., και John P. D'Angelo; Douglas Brent West. Mathematical Thinking: Problem-solving and Proofs. Upper Saddle River, NJ: Prentice Hall, 2000.
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