(1) James Stewart: Calculus - Early Transcendentals, 7th edition
(2) WebAssign access code
You can buy the Purdue Custom edition (from the University
Bookstore or Follett's). It comes with the WebAssign online access
code which allows you to have three (need not be consecutive)
semesters' access. Alternatively, you can also buy the book anywhere else
and purchase the
code for one, two or three semesters' access. The online access
is equipped with the Stewart eBook option.
Some tips about using WebAssign.
(Note: as a rule of thumb, always input exact mathematical expression,
no approximations (by using calculators) unless otherwise told by
the questions. Capital and small letter variables Phi, phi, Pi, pi,
Theta, theta and so forth are treated as different variables.)