Much biographical information is found in reference books.
Encyclopedias, either the all-purpose kind like Encyclopedia Britannica or encyclopedias and dictionaries for particular topics such as Encyclopedia of Evolution or Dictionary of Mexican American History may be useful sources. Biographies of individuals are usually placed with other books about the same subject. A book about Babe Ruth would be with other books about baseball. The Biography Source Extensive, annotated directory of links to sites that focus on the lives of individuals or groups of people. Biographies of over 25,000 personalities.