TY  - BOOK
AU  - Spector,Paul E.
TI  - Research designs
T2  - Sage University Papers Series
SN  - 0-8039-1709-0
AV  - H62 S64
PY  - 1981///
CY  - Beverly Hills, Calif.
PB  - Sage
N1  - Bibliiografia: p. 78-80
ER  -