TY  - BOOK
AU  - Goldberg,Samuel
TI  - Introduction to difference equations: with illustrative examples from economics, psychology, and sociology
SN  - 0486650847
U1  - 515.625 
PY  - 1986///
CY  - New York
PB  - Dover Publications
KW  - Difference equations
KW  - Social sciences--Mathematical models
N1  - Includes index
ER  -