TY  - BOOK
AU  - Packer, Arnold H.
TI  - Models of economic systems. : a theory for their development and use
U1  - 330.12 
PY  - 1972///
CY  - New York
PB  - MIT Press
KW  - Physics--Philosophy
KW  - Economic policy--Mathematical models
KW  - Manners and customs
ER  -