Pollock, P. H., & Pollock, P. H. (2009). An SPSS companion to political anlysis (3rd ed.). CQ Press.
Lua i Stíl Chicago (17ú heag.)Pollock, Philip H., agus Philip H. Pollock. An SPSS Companion to Political Anlysis. 3rd ed. Washington: CQ Press, 2009.
Lua MLA (8ú heag.)Pollock, Philip H., agus Philip H. Pollock. An SPSS Companion to Political Anlysis. 3rd ed. CQ Press, 2009.
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