TY  - BOOK
AU  - Ragin,Charles C
TI  - Constructing social research: the unity and diversity of method 
T2  - Sociology for a new century
SN  - 0803990219
U1  - 300.72 
PY  - 1994///
CY  - Thousand Oaks, Calif.
PB  - Pine Forge Press
KW  - Investigación social
ER  -