You may be able to find information in biographical dictionaries or online at the websites of universities where historians teach.
These are available through the library in e-book format and/or print.
To search for biographies of presidents, search By Subject rather than author. Use the Advanced Search and enter the name in the following format: LAST NAME, FIRST NAME.
To search with keywords for biographies, enter the name of a president in the search box, and in the left column, under "Content" limit to "Biography."
Under "Audience" you may also need to limit to "Non-Juvenile" to eliminate books aimed at younger audiences, and under "Content" limit to "Non-Fiction."
Below are some subject headings that may be helpful to you.
Explore options to limit your search in the Advanced Search. Options may include "Book Reviews", "Essays" and "Journal Articles".