TY  - BOOK
AU  - Lewis J Perry
TI  - Introduction to mathematics for students of econom
T2  - Macmillan Student Editions, 28
U1  - B28:X, J9;K9;8TD3 
PY  - 1959///
CY  - London
PB  - Macmillan          
KW  - Statistics
ER  -