Search the MSU catalog for books that provide general overviews of your research topic. You can also find books that contain primary sources, such as autobiographies and letters. See the Primary Sources page for tips on searching for primary sources in the catalog.
Ordinarily if your book was not available (checked out to another patron) you would be strongly encouraged to use interlibrary loan and have MSU Libraries borrow it for you. You *can* still use ILL, but it may be slow as not all other institutions are filling orders. See the Interlibrary Services page: https://lib.msu.edu/ils/