TY  - BOOK
AU  - Hedrick,Terry E.
AU  - Bickman, Leonard,
AU  - Rog, Debra J.
TI  - Applied research design: a practical guide 
T2  - Applied social research methods series
SN  - 0-8039-3234-0
U1  - 300.7'2 
PY  - 1993///
CY  - Newbury Park, Calif.,
PB  - SAGE Publications
KW  - Ciencias sociales
KW  - Investigación
KW  - Metodología
ER  -