ADDAI, I., and J. KUGBE. “Planting Dates and Nutrition Management Regimes Impact Positively on Bulb Size, Quality and Yield of Rain-Fed Onion”. Ghana Journal of Science, Technology and Development, Vol. 6, no. 1, May 2019, pp. 44-51, http://gjstd.org/index.php/GJSTD/article/view/129.