LaVergne, D. D., R. Bakhtavoryan, and R. L. Williams. “Using a Logistic Regression Approach to Estimate the Influence of Demographical Factors on Small Engine and Welding Competency of Secondary Agricultural Education Teachers”. Texas Journal of Agriculture and Natural Resources, vol. 31, May 2018, pp. 1-11, https://txjanr.agintexas.org/index.php/txjanr/article/view/355.