Thoron, Andrew C., and Brian E. Myers. “Impact of Gender, Ethnicity, Year in School, Social Economic Status, and State Standardized Assessment Scores on Student Content Knowledge Achievement When Using Vee Maps As a Formative Assessment Tool”. Journal of Agricultural Education, vol. 52, no. 1, Mar. 2011, pp. 85-95, doi:10.5032/jae.2011.01085.