TY  - BOOK
AU  - Gerring, John
TI  - Case study research : principles and practices
SN  - 9780521676564
SN  - 200605181
U1  - 001.432 GER 
PY  - 2007///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Historical method
N1  - Includes bibliographical references and indexes
ER  -