You only need one book, your choice of either of these

Tue Oct 14 11:22:58 2008
mac2311,s09,All sections
Title,Single Variable Calculus, Early Transcendentals
Author,Stewart
Edition/date,6th ed
Publisher,Thomson Brooks Cole
ISBN,0495481300
Comments:,mac2312 also uses this book

Tue Oct 14 11:24:10 2008
mac2311,s09,All sections
Title,Calculus, Early Transcendentals
Author,Stewart
Edition/date,6th ed
Publisher,Thomson Brooks Cole
ISBN,0495481297
Comments:,Whole book both mac2312 and mac2313 can use this book

The publisher says:
Here are the bundles with Web Assign:

Single Variable 0495481300   calculus 1 and 2
Multivariable 0495427624     calculus 3
Single Volume 0495481297     calculus 1, 2 and 3

All are EARLY TRANSCENDENTALS.