TY  - BOOK
AU  - Barnett,Raymond
AU  - Ziegler,Michael R.
TI  - Precalculus: graphs and models 
SN  - 9780073051963
CY  - New York
PB  - McGraw-Hill Higher Education
KW  - Functions--Graphic methods--Textbook
KW  - Functions--Textbooks
ER  -