Ritaga, IA, RG Escalada, and AS Almendras. “GROWTH AND YIELD OF SOYBEAN AS AFFECTED BY INOCULATION WITH STRAINS OF Rhizobium Japonicum”. Annals of Tropical Research 2, no. 4 (November 24, 1980): 206–212. Accessed December 5, 2025. https://atr.vsu.edu.ph/article/view/810.