1. Agriculture and Agri-Food Canada, 2009. Water requirements for pastured livestock. Online: 〈http://www4.agr.gc.ca/AAFC-AAC/display-afficher.do?id=1237489569438&lang=eng〉. 23 February 2010.
2. Alberta Environment (AE), 1999. Surface Water Quality Guidelines for Use in Alberta. Environmental Assurance Division, Science and Standards Branch, ISBN 0-7785-0897-8, Edmonton, Alberta. 20pp.
3. Al Mahruki, A., Alloway, B., Patzelt, H., 2006. The use of reed-bed technology for treating oil-production waters in the Sultanate of Oman, The Society of Petroleum Engineers, SPE Paper 98548, pp. 1–6.
4. American Petroleum Institute (API), 2004. Risk-Based Screening Levels for the Protection of Livestock Exposed to Petroleum Hydrocarbons. Regulatory Analysis and Scientific Affairs, Publication 4733, Washington, D.C. 50 pp.
5. American Petroleum Institute (API), 2006. Strategies for Addressing Salt Impacts of Produced Water Releases to Plants, Soil, and Groundwater. Groundwater Services Inc., Publication 4758, 28 pp.