Lubis, Iskandar, et al. “Growth Performance and Productivity of Several Soybean Genotypes (Glycine Max L. Merr.) Cultivated at High Altitude Areas in Indonesia”. Journal of Tropical Crop Science, vol. 8, no. 01, Mar. 2021, pp. 1-7, doi:10.29244/jtcs.8.01.1-7.