TY  - BOOK
AU  - Barnett, Raymond A.
AU  - Ziegler,Michael R.
AU  - Byleen,Karl E.
TI  - Precalculus: graphs and models 
SN  - 0072424303
PY  - 2005///
CY  - Boston
PB  -  McGraw Hill
KW  - Functions
KW  - Graphic methods
N1  - Includes index
ER  -