- William Cocke, Sara Jensen, “The sequence of non k-th powers of a finite group G”, Communications in Algebra, 47, no. 4, 2019, 1835
- W. Cocke, I. M. Isaacs, D. Skabelund, “On the number of elements that are not kth powers in a group”, Arch. Math., 105, no. 6, 2015, 529