NURNBERGER-HAAG, Julie; WERNET, Jamie L. Sparking Surprise: A Negative Number Game to Promote Productive Concepts of Addition and Subtraction. Ohio Journal of School Mathematics, [S. l.], v. 82, n. 1, 2019. Disponível em: https://ohiomathjournal.org/index.php/OJSM/article/view/6663. Acesso em: 5 may. 2024.