TY  - BOOK
AU  - Gerring,John
TI  - Social science methodology: a criterial framework 
SN  - 0521801133
PY  - 2001///
CY  - Cambridge, U. K.
PB  - Cambridge University Press
KW  - Social sciences
KW  - Methodology
N1  - Includes bibliographical references (p. 259 - 292) and index
ER  -