Ahmad, Tanveer, and Glen C. Shinn. “Modeling Tractor Selection Decisions for Developing Countries: Implecations for Extention Education”. Journal of Agricultural Systems, Technology, and Management 4, no. 2 (April 1, 1989): 4–12. Accessed August 25, 2026. https://ticket17180.pkpmisc01.publicknowledgeproject.org/index.php/jastm/article/view/11917.