When you find a book that is relevant to your topic, always check the bibliography for other sources and then ask a librarian for help with finding them. The author of the book has already done much of your research for you, and he/she spent many weeks/months/years of his/her life doing research. Take advantage of it!
If you teacher has reserve books for you to read, they will be available on 2 hour reserve at the Welcome desk.
Oliver Wendell Holmes Library Catalog
You may also explore OWHL's collection via NOBLE Catalog to get titles like these:
Republican Beijing: The City and Its History from ebrary, Inc.
It is a great source for modern Chinese culture and language with featured articles on each issue. It also covers topics like business, economy, and people's daily life on food, entertainment and love etc. You are going to love it!
Search the full text of books that Google has scanned and stored in its digital database. The books come from large research university and public libraries. Full text is available for books published before 1923. For books still under copyright protection, only a small snippet of text is available.