TY  - BOOK
AU  - Isaac, Stephen [et al.]
TI  - Handbook in research and evaluation : a collection of principles, methods, and strategies useful in the planning, design, and evaluation of studies in education and the behavioral sciences
SN  - 0-912736-25-9
PY  - 1981///
CY  - San Diego 
PB  - EDITS Publishers
N1  - Бібліогр. в підрядк. прим
ER  -