TY  - BOOK
AU  - Open University, Social Sciences, 2nd Level Course
ED  - Open University, Social Sciences, 2nd Level Course
TI  - Statistical sources. 16 units
SN  - 0 335 04602 9
U1  - Sigma s, L5.3 
PY  - 1975///
CY  - Keynes
PB  - Open University         
KW  - Social Sciences
ER  -