Barrera, H. F. (2021). Problem-solving, Numerical and Variational Thinking in Elementary School: A Review. Universidad Pedagógica y Tecnológica de Colombia.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBarrera, Hugo Fernando. Problem-solving, Numerical and Variational Thinking in Elementary School: A Review. Universidad Pedagógica y Tecnológica de Colombia, 2021.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBarrera, Hugo Fernando. Problem-solving, Numerical and Variational Thinking in Elementary School: A Review. Universidad Pedagógica y Tecnológica de Colombia, 2021.
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