BRUNI, M. SPUHLER, D.                    
                                            (2018):
                    
                                        https://sswm.info/water-nutrient-cycle/water-sources/hardwares/groundwater-sources/springs
            
        
                
                                            Sustainable Sanitation and Water Management (SSWM) Toolbox                    
                                            [Accessed: 01.09.2018]