Badgley, C., Moghtader, J., Quintero, E., Zakern, E., Chappell, M.J., Avile, K., Aviles Vasques, K., Samulon, A. and Perfecto, I. 2007. Organic agriculture and the global food supply. Renewable Agriculture and Food Systems 22(2):86–108.
Khan, S.I., Muvaney, R.L. and Ellsworth, T.R. 2014. The potassium paradox: Implications for soil fertility, crop production and human health. Renewable Agriculture and Food Systems 29:3–27.