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              Goertz, Gary and Harvey Starr (eds.) (2003): Necessary Conditions: Theory, Methodology, and Applications, Rowman and Littlefield, Lanham.
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              Goertz, Gary/Starr, Harvey (2002): Necessary Conditions: Theory, Methodology, and Applications. Lanham/Boulder/New York: Rowmann & Littlefield.
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              Goertz, Gary/Starr, Harvey (Hg.) (2003), Necessary> conditions: Theory, Methodology, and Applications, Lanham, MD.
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