Ропство — разлика између измена

* {{Cite book|ref=harv| last=Bales| first = Kevin| title = Disposable People. New Slavery in the Global Economy| location = | publisher = Revised Edition, University of California Press|year=2004|isbn = 978-0-520-24384-2|pages=}}

* {{Cite book|ref=harv| editor = Kevin Bales| title = Understanding Global Slavery Today. A Reader| location = | publisher = University of California Press|year=2005|isbn = 978-0-520-24507-5|pages=}}

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