TY  - BOOK
AU  - Mason,Robert D.(Robert Deward)
AU  - Lange,Walter H.
AU  - Rousos,Temoleon G.
TI  - Programmed learning aid for business and consumer mathematics
SN  - 0256012725
PY  - 1978///
CY  - Homewood, Ill.
PB  - Learning Systems Company
KW  - Business mathematics
KW  - Problems, exercises, etc
KW  - Programmed instruction
ER  -