1. 1600/2002/EC – Parliament and Council of the European Union. 2002. Decision No 1600/2002/EC of the European Parliament and of the Council of 22 July 2002 laying down the Sixth Community Environment Action Programme. OJ L 242/1–15. Brussels: CEC.
2. Potential impacts of climate change on the grain yield of maize for the midlands of KwaZulu-Natal, South Africa
3. Abu-Zeid M, Hamdy A. 2002. Water vision for the 21 century in the Arab World, World Water Council, International Policy Think Tank. Marseille, France: Arab countries vision consultations, p. 97.
4. Alexandratos N, Bruinsma J. 2012. World agriculture towards 2030/2050: the 2012 revision. ESA Working paper No. 12–03. Rome: FAO.
5. Al-kaisi MM, Broner I. 2014. Crop water use and growth. Colorado State University Extension. US Central Great Plains Research Station. Available from: www.ext.colostate.edu/pubs/crops/04715.html.