TY  - BOOK
AU  - Webb, Eugene T
AU  - Campbel, Donald T
AU  - Schwartz, Richard D
AU  - Sechrest, Lee
AU  - Grove, Janet Belew
TI  - Nonreactive measures in the social sciences 
SN  - 0395307678 
AV  - H62 .N675 1981
U1  - 300.72 22
PY  - 1981///
CY  - Boston 
PB  - Houghton Mifflin
KW  - Social sciences
KW  - Research
N1  - Previous ed.: Unobtrusive measures. 1966; Includes index; Bibliography: p. 331-378
ER  -