If Princeton does not own the book or is charged out:
Try Borrow Direct first. It is a very fast way of getting books owned by Brown, the Center for Research Libraries, Columbia, Cornell, Dartmouth, Duke, Harvard, Johns Hopkins, MIT, Stanford, University of Chicago, University of Pennsylvania, or Yale.
Interlibrary Services can borrow the book if not available in Borrow Direct libraries. While the Catalog indicates if Princeton owns a particular book. Worldcat will show what other libraries own.
If Princeton does not subscribe to the journal you need: