International Scientific Centre of Fertilizers., Welte, E., & Szabolcs, I. (1989). Protection of water quality from harmful emissions with special regard to nitrate and heavy metals: 1987, 1-4 September, Balatonfüred, Hungary : proceedings. CIEC.
Cita Chicago Style (17a ed.)International Scientific Centre of Fertilizers., Erwin Welte, y I. Szabolcs. Protection of Water Quality from Harmful Emissions with Special Regard to Nitrate and Heavy Metals: 1987, 1-4 September, Balatonfüred, Hungary : Proceedings. Belgrade: CIEC, 1989.
Cita MLA (9a ed.)International Scientific Centre of Fertilizers., et al. Protection of Water Quality from Harmful Emissions with Special Regard to Nitrate and Heavy Metals: 1987, 1-4 September, Balatonfüred, Hungary : Proceedings. CIEC, 1989.
