International Commission of Hydrological Sciences, Kovar, K., & Soveri, J. (1994). Groundwater quality management: Proceedings of an international conference held at Tallinn, Estonia, from 6-9 September 1993 ; jointly organized by the International Commission of Hydrological Sciences, and the Institute of Ecology, Tallinn Estonia (17th ed.). International Association of Hydrological Sciences.
Cita Chicago (17th ed.)International Commission of Hydrological Sciences, K. Kovar, i J. Soveri. Groundwater Quality Management: Proceedings of an International Conference Held at Tallinn, Estonia, from 6-9 September 1993 ; Jointly Organized by the International Commission of Hydrological Sciences, and the Institute of Ecology, Tallinn Estonia. 17th ed. Oxfordshire, Eng: International Association of Hydrological Sciences, 1994.
Cita MLA (9th ed.)International Commission of Hydrological Sciences, et al. Groundwater Quality Management: Proceedings of an International Conference Held at Tallinn, Estonia, from 6-9 September 1993 ; Jointly Organized by the International Commission of Hydrological Sciences, and the Institute of Ecology, Tallinn Estonia. 17th ed. International Association of Hydrological Sciences, 1994.