Proceedings of an international symposium of the european grassland federation Wageningen, N., Meer, H. G., Unwin, R. J., Dijk, T. A., & Ennik, G. C. (1987). Animal manure on grassland and fodder crops. Fertilizer or waste? (1 edición.). Dordrecht, Países Bajos: Springer.

Proceedings of an international symposium of the european grassland federation Wageningen, Netherlands), H. G. Meer, R. J. Unwin, T. A. Dijk, and G. C. Ennik. Animal Manure On Grassland and Fodder Crops. Fertilizer or Waste? 1 edición. Dordrecht, Países Bajos: Springer, 1987.

Proceedings of an international symposium of the european grassland federation Wageningen, Netherlands), et al. Animal Manure On Grassland and Fodder Crops. Fertilizer or Waste? 1 edición. Dordrecht, Países Bajos: Springer, 1987.