Designing social inquiry

KING, Gary - KEOHANE, Robert O. - VERBA, Sidney. Designing social inquiry : scientific inference in qualitative research. Princeton : Princeton University Press, 1994. xi, 247 stran. Princeton paperbacks. Available on Internet: <http://www.loc.gov/catdir/description/prin021/93039283.html> <http://www.loc.gov/catdir/toc/prin031/93039283.html> ISBN 0-691-03471-0.