1. FAO. Statistical database, 2004. See also: 〈http://faostat.fao.org/faostat/collections?subset=agriculture〉.
2. State Institute of Statistics (DIE). Statistics (İstatistikler), 2002. See also: 〈http://www.die.gov.tr/istatistikler.html〉 (in Turkish).
3. Export Promotion Centre of Turkey (IGEME). Sectoral reports (Sektör Raporları), 2002. See also: 〈http://www.igeme.org.tr/〉.
4. Energy input output analysis in Turkish agriculture;Ozkan;Renew Energy,2004
5. Comparative efficiency of energy use in rice production;Dutt;Energy,1982