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Since it was not that hard to look for sources and references for this article (as opposed to the quite drastic action of deleting it), I did it myself. My sources are the internet and my university texts, which are in Spanish and might be hard to get for an English speaker. If somebody has better sources or thinks I did something wrong, feel free to tell me/edit the article. --Lobizón 00:26, 13 October 2006 (UTC)
Additionally, this article, along with the "secondary and tertiary sectors", should be renamed to "primary sector of the economy", since that's the correct terminology.--Lobizón 00:29, 13 October 2006 (UTC)