Steffen, Richard W., Dennis G. Watson, and Tony V. Harrison. “Teaching Beam Sizing Concepts Using the Experimental Process”. Journal of Agricultural Systems, Technology, and Management 18, no. 1 (March 1, 2004). Accessed August 25, 2026. https://ticket17180.pkpmisc01.publicknowledgeproject.org/index.php/jastm/article/view/11779.