TY  - GEN
ED  - The British Open University Foundation Center
TI  - Block 4 data collection procedures: research methods in education and social sciences / 
SN  - 0335074391
U1  - 001.433 
PY  - 1979///
CY  - Walton Hall : 
PB  - Open University Press
KW  - Data collection
N1  - Includes bibliographical references
ER  -