Ritaga, I., Escalada, R. and Almendras, A. (1980) “GROWTH AND YIELD OF SOYBEAN AS AFFECTED BY INOCULATION WITH STRAINS OF Rhizobium japonicum”, Annals of Tropical Research, 2(4), pp. 206–212. Available at: https://atr.vsu.edu.ph/article/view/810 (Accessed: 5 December 2025).