Nitrate in European Watercourses - Earth Sciences bibliographies - in Harvard style

"The first legal standard for nitrate was set in 1980 and the current drinking water standard is 50 mg/l."

In-text: (DEFRA - Drinking Water Inspectorate, n.d.)

Your Bibliography: DEFRA - Drinking Water Inspectorate, n.d. Nitrate. London: Drinking Water Inspectorate, p.1.

In-text: (Department for Environment, Food and Rural Affairs, 2015)

Your Bibliography: Department for Environment, Food and Rural Affairs, 2015. Total N deposition | UK Pollutant Deposition. [online] Pollutantdeposition.defra.gov.uk. Available at: <http://pollutantdeposition.defra.gov.uk/node/88> [Accessed 13 March 2015].

"The Drinking Water Directive (98/83/EC) sets a maximum allowable concentration for nitrate of 50 mg/l."

In-text: (European Environment Agency, Andreas Scheidleder & Niels Thyssen, 2003)

Your Bibliography: European Environment Agency, Andreas Scheidleder & Niels Thyssen, 2003. Nitrate in groundwater. Copenhagen: European Environment Agency, pp.1-2.

In-text: (World Health Organisation, 2011)

Your Bibliography: World Health Organisation, 2011. Nitrate and Nitrite in Drinking-water (as part of WHO Guidelines for Drinking-water Quality). Geneva: World Health Organisaiton, pp.4 and 16.