TY  - BOOK
AU  - SOMMER, Roberts, author.
AU  - Somer Barbara B., author.
TI  - A practical guide to behavioral research: tools and techniques
SN  - 0195026918
PY  - 1980///
CY  - Oxford: 
PB  - Oxford University Press
KW  - Behavior - Research - Methods
KW  - Psychological research
ER  -