^Pat McGeough. Where the poppy is king. Sydney Morning Herald. 2007-03-05 [2020-03-15]. (原始内容存档于2011-06-05). More than 90 per cent of the province's arable land is choked with the hardy plant. A 600-strong, US-trained eradication force is hopelessly behind schedule on its target for this growing season in Helmand - to clear about a third of the crop, which is estimated to be a head-spinning 70,000 hectares.
^Afghanistan still the largest producer of opium: UN report. Zee News. [2020-03-15]. (原始内容存档于2007-09-28). She said opium cultivation is concentrated in the south of the country, with just one province ‘Helmand’ accounting for 42% of all the illicit production in the world. Many of the provinces with the highest levels of production also have the worst security problems.
^Helmand(PDF). Program for Culture & Conflict Studies. 2010-05-01 [2012-12-28]. (原始内容(PDF)存档于2012-10-08).