Saeed, R., M. Qasim, I. Mahmood, and W. Akhtar. “FACTORS AFFECTING WHEAT YIELD VARIATION OF SMALLHOLDER FARMERS IN PUNJAB PROVINCE: APPLICATION OF ORDERED LOGISTIC MODEL”. Advances in Agriculture and Animal Sciences, vol. 37, no. 2, Dec. 2021, pp. 126-31, doi:10.47432/2021.37.2.8.