1. BALLANTINE, J. E. and B. J. FORDE 1970. The effect of light intensity and temperature on plant growth and chloroplast ultrastructure in soybean. Amer. J. Bot. 57: 1150-1159.
2. FISHER, D. B. 1967. An unusual layer of cells in the mesophyll of the soybean leaf. Bot. Gaz. 128:215-218.
4.HARBERLANDT, G. 1914. Physiological Plant Anatomy. Macmillan, London.
5. JEFFERS, D. L. and R. M. SHIBLES 1969. Some effects of leaf area, solar radiation, air temperature, and variety on net photosynthesis in field-grown soybeans. Crop Sci. 9: 762-764.