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Bryman A, Cramer D. Quantitative data analysis with IBM SPSS 17, 18 and 19: a guide for social scientists [Internet]. London: Routledge; 2011. Available from: https://uoelibrary.idm.oclc.org/login?qurl=https://www.taylorfrancis.com/books/9780203180990
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Field AP. Discovering statistics using SPSS: (and sex, drugs and rock ‘n’ roll) [Internet]. 3rd ed. Los Angeles: SAGE Publications; 2009. Available from: http://exeter.eblib.com/patron/FullRecord.aspx?p=743649
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Colin D. Gray, Kinnear, Paul R . IBM SPSS statistics 19 made simple [Internet]. New York: Psychology Press; 2012. Available from: http://www.vlebooks.com/vleweb/product/openreader?id=Exeter&isbn=9780203723524
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Jacquelien  van Stekelenburg. Contextualizing Contestation: Framework, Design, and Data. Mobilization: An International Quarterly [Internet]. 2012;17(3):249–62. Available from: https://uoelibrary.idm.oclc.org/login?url=http://mobilizationjournal.org/doi/pdf/10.17813/maiq.17.3.a4418x2q772153x2
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Stefaan  Walgrave. Selection and Response Bias in Protest Surveys. Mobilization: An International Quarterly [Internet]. 2011;16(2):203–22. Available from: https://uoelibrary.idm.oclc.org/login?url=http://mobilizationjournal.org/doi/pdf/10.17813/maiq.16.2.j475m8627u4u8177
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Stefaan  Walgrave. RESPONSE PROBLEMS IN THE PROTEST SURVEY DESIGN: EVIDENCE FROM FIFTY-ONE PROTEST EVENTS IN SEVEN COUNTRIES. 2016;21(1):83–104. Available from: https://uoelibrary.idm.oclc.org/login?url=http://doi.org/10.17813/1086/671X-21-1-83
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Snow, David, Soule, Sarah. Chapter 1. In: A primer on social movements. New York, NY: W. W. Norton; 2010. p. 1–22.
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Crossley, Nick. Chapter 1. In: Making sense of social movements [Internet]. Buckingham : Open University Press, 2002.; Available from: https://www.dawsonera.com/guard/protected/dawson.jsp?name=https://elibrary.exeter.ac.uk/idp/shibboleth&dest=http://www.dawsonera.com/depp/reader/protected/external/AbstractView/S9780335231270
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Della Porta, Donatella. 1.2 What is Distinctive about Social Movements. In: Social movements :  an introduction [Internet]. Malden, MA. : Blackwell, 2006.; p. 20–9. Available from: http://www.dawsonera.com/guard/protected/dawson.jsp?name=University%20of%20Exeter&dest=http://www.dawsonera.com/depp/reader/protected/external/AbstractView/S9781405148214
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Mario Diani and Ivano Bison. Organizations, Coalitions, and Movements. Theory and Society [Internet]. 2004;33(3):281–309. Available from: https://uoelibrary.idm.oclc.org/login?url=http://www.jstor.org/stable/pdfplus/4144874.pdf
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Opp, Karl-Dieter. Chapter 2. In: Theories of political protest and social movements: a multidisciplinary introduction, critique, and synthesis [Internet]. New York: Routledge; 2009. Available from: http://swbplus.bsz-bw.de/bsz304544558vlg.htm
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Colin D. Gray, Kinnear, Paul R. IBM SPSS statistics 19 made simple [Internet]. New York: Psychology Press; 2012. Available from: http://www.vlebooks.com/vleweb/product/openreader?id=Exeter&isbn=9780203723524
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