Citation
Pretty, J., Smith, G., Goulding, K.W.T., Groves, S.J., Henderson, I., Hine, R.E., King, V., van Oostrum, J., Pendlington, D.J., Vis, J.K. & Walter, C. 2008. Multi-year assessment of Unilever's progress towards agricultural sustainability I: indicators, methodology and pilot farm results. International Journal of Agricultural Sustainability 6: 62. doi:10.3763/ijas.2007.0322