Cowen's rules for giving - http://marginalrevolution.com/marginalrevolution/2007/08/discover-your-i.html

Charity warns against giving $ to beggars - http://www.dailymail.co.uk/news/article-1339943/Dont-beggars-theyll-buy-drugs-warns-homeless-charity.html

Would you cheat for charity? - http://digest.bps.org.uk/2012/04/would-you-cheat-for-charity.html

The Way We Think About Charity is Wrong (VERY GOOD) https://www.youtube.com/watch?v=bfAzi6D5FpM

Why are donations to government so small - http://econlog.econlib.org/archives/2012/04/why_are_donatio.html