1. Biological aspects of symbiotic nitrogen fixation;Allen;Encycl. Plant Physiol. [N.S.],1958
2. Response of the peanut plant to inoculation with rhizobia with special reference to morphological development of the nodules;Allen;Bot.Gaz. (Chicago),1940
3. Leghaemoglobin;Appleby,1974
4. Characterization and improved separation of soybean leghemoglobins;Appleby;Biochemistry,1975
5. Appleby, C. A., Bergersen, F. J., MacNicol, P. K., Turner, G. L., Wittenberg, B. A., and Wittenberg, J. B. (1976). Role of leghaemoglobin in symbiotic nitrogen fixation. Proc. Int. Symp. Nitrogen Fixation, 1st, 1974, pp. 274–292.