TY  - BOOK
AU  - SOMMER,Robert
AU  - SOMMER,Barbara
TI  - A Practical guide to behavioral research: Tools and techniques 
SN  - 0195026918
PY  - 1980///
CY  - New York 
PB  - Oxford University Press
KW  - Behavior
KW  - Research
KW  - Methods
N1  - Includes bibliographical references and index
ER  -