The library IS a good starting point. Repeat after me: library.princeton.edu, library.princeton.edu, library.princeton.edu
No need to Google it.
Let's practice converting a "keyword search" into a search using the "controlled vocabulary" of Library of Congress Subject Headings.
Books
Try searching the catalog for Xi Jinping or "Rule of Law" or the conjunction of the two
I always look for a recent report by the Congressional Research Service (not really a book, but will show up in the Catalog).
Journals
China Quarterly
Librarians
Joshua Seufert, the Chinese Studies Librarian, is an amazing resource.
Databases curated by Chinese Studies Librarian
News