APA

King G., Keohane R. O. & Verba S. (1994). Designing social inquiry: scientific inference in qualitative research. New Jersey: Princeton University Press.

Chicago

King Gary, Keohane Robert O and Verba Sidney. 1994. Designing social inquiry: scientific inference in qualitative research. New Jersey: Princeton University Press.

Harvard

King G., Keohane R. O. and Verba S. (1994). Designing social inquiry: scientific inference in qualitative research. New Jersey: Princeton University Press.

MLA

King Gary, Keohane Robert O and Verba Sidney. Designing social inquiry: scientific inference in qualitative research. New Jersey: Princeton University Press. 1994.