TY  - BOOK
AU  - Lumsden,Keith
TI  - Microeconomics: a programmed book 
AV  - HB171.5 .L8 1970
PY  - 1970///
CY  - Englewood Cliffs, N.J.
PB  - Prentice-Hall
KW  - Microeconomics-Programmed instruction
KW  - Microeconomía
KW  - Microeconomía-Estudio y enseñanza
ER  -