Barrera, H. F. (2021). Problem-solving, Numerical and Variational Thinking in Elementary School: A Review. Universidad Pedagógica y Tecnológica de Colombia.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Barrera, Hugo Fernando. Problem-solving, Numerical and Variational Thinking in Elementary School: A Review. Universidad Pedagógica y Tecnológica de Colombia, 2021.
MLA -ийн эшлэл (9 дэх хэвлэлт)Barrera, Hugo Fernando. Problem-solving, Numerical and Variational Thinking in Elementary School: A Review. Universidad Pedagógica y Tecnológica de Colombia, 2021.
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