Cita APA

Pollock, P. H., & Pollock, P. H. (2009). An SPSS companion to political anlysis (3rd ed.). CQ Press.

Citación estilo Chicago

Pollock, Philip H., and Philip H. Pollock. An SPSS Companion to Political Anlysis. 3rd ed. Washington: CQ Press, 2009.

Cita MLA

Pollock, Philip H., and Philip H. Pollock. An SPSS Companion to Political Anlysis. 3rd ed. CQ Press, 2009.