Orum, Anthony M., Joe R. Feagin and Gideon Sjoberg, "Introduction: The Nature of the Case Study," in: Anthony M. Orum, Joe R. Feagin and Gideon Sjoberg, eds., A Case for the Case Study (London: The University of North Carolina Press, 1991), 1-26
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Orum, A. M., Feagin, J. R., Sjoberg, G. (1991). Introduction: The Nature of the Case Study. London: The University of North Carolina Press. A Case for the Case Study, pp. 1-26.
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