Sutton, M. A., Oenema, O.
& Dalgaard, T. (2015).
Foreword. I H. Westhoek, J. P. Lesschen, T. Rood, S. Wagner, A. Leip, A. De Marco, D. Murphy-Bokern, M. A. Sutton & O. Oenema (red.),
Nitrogen on the Table: The influence of food choices on nitrogen emissions and the European environment Centre for Ecology & Hydrology.
http://www.clrtap-tfrn.org/webfm_send/592