Barrera, H. F. (2021). Problem-solving, Numerical and Variational Thinking in Elementary School: A Review. Universidad Pedagógica y Tecnológica de Colombia.
Chicago-čujuhus (17. p.)Barrera, Hugo Fernando. Problem-solving, Numerical and Variational Thinking in Elementary School: A Review. Universidad Pedagógica y Tecnológica de Colombia, 2021.
MLA-čujuhus (9. p.)Barrera, Hugo Fernando. Problem-solving, Numerical and Variational Thinking in Elementary School: A Review. Universidad Pedagógica y Tecnológica de Colombia, 2021.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
