Cited by Common Sense for Drug Policy на http://www.csdp.org/research/nixon-pot.txt.
27
International Centre for Prison Studies, http://www.prisonstudies.org.
28
Maclean R. We’re Not a Gang, We’re a Union, Say the Drug Killers of Ciudad Juarez // London Times. March 27,2010, доступно на сайте автора по ссылке https://macleanandrickardstraus.wordpress.com/2010/03/27/were-not-a-gang-were-a-union-say-the-drug-killers-of-ciudad-juarez.