Hill, George C., Joe G. Harper, and William B. Symons. “An Analysis of Garicultural Mechanics Research Reported in Three Principal Journals in the 1980’s”. Journal of Agricultural Systems, Technology, and Management 4, no. 1 (October 1, 1988): 18–25. Accessed February 23, 2025. https://jastm.org/index.php/jastm/article/view/11903.