Garrett, Kristina C., and Kristen Hummel. “A Combinatorial Proof of the Sum of $q$-Cubes”. The Electronic Journal of Combinatorics 11, no. 1 (January 23, 2004): R9. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v11i1r9.