Roderick, Stephen and Vaarst, Mette    (2019) Improving organic animal farming for the future.    In: Vaarst, Mette and Roderick, Stephen (Eds.)   Improving organic animal farming. 1 edition. Burleigh Dodds Series in Agricultural Science, no. 46. Burleigh Dodds Science Publishing, Cambridge UK, chapter 18, pp. 375-384.