TY  - BOOK
AU  - Bingham,Robert C.
AU  - Walstad,William B.
TI  - Economic concepts: a programmed approach 
SN  - 0070449635
AV  - HB171.5 .B52
PY  - 1987///
CY  - New York
PB  - McGraw-Hill, Inc.
KW  - Economics
KW  - Programmed instructions
ER  -