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Red 4: == Literatura == * [http://polisci.berkeley.edu/people/person/thad-dunning Dunning, Thad]. ''[http://www.amazon.com/Natural-Experiments-Social-Sciences-Design-Based/dp/1107698006 Natural Experiments in the Social Sciences: A Design-Based Approach]''. [http://www.cambridge.org/us/academic/subjects/politics-international-relations/research-methods-politics/natural-experiments-social-sciences-design-based-approach Cambridge University Press]. * Shadish, William R., Thomas D. Cook, and Donald T. Campbell. (2001) ''Experimental and Quasi-experimental Designs for Generalized Causal Inference''. Boston: Houghton Mifflin. ISBN 0-395-61556-9 [http://depts.washington.edu/methods/readings/Shadish.pdf Excerpts]

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