Boris Rewald, Omer Falik, Douglas Godbold, Shimon Rachmilevitch. 2014. Ecophysiology of root systems-environment interaction Frontiers E-books,Pp.316. ISBN2889192857, 9782889192854
Felix Dakora, Samson B. M. Chimphango, Alex J. Valentine, Claudine Elmerich, William E. Newton. 2008. Biological Nitrogen Fixation: Towards Poverty Alleviation through Sustainable Agriculture: Proceedings of the 15th International Nitrogen Fixation Congress and the 12th International Conference of the African Association for Biological Nitrogen Fixation Springer Science & Business Media,Pp.392. ISBN1402082525, 9781402082528