Canon IR3320i Copying Manual page 96

1
Place your original on the platen glass, and press [Two-sided].
1
If you want to make copies in page order, begin copying from the first page and work your way forward.
Place the original face down, so that its top edge is aligned with the back edge of the platen glass.
2
Press [Book 2-Sided], and press [Next].
1-86 Two-Sided Copying (Two-Sided)