If you are searching for texts written by a specific ancient or medieval figure, you can often their texts online since these works are usually not copyrighted. Type in the name of the person Google along with a word like texts, writings, or works.
You can find the famous Scholasticism philosopher's writings at:
Tips on Finding Credible Sites:
>One clue that can help you decide if a site is credible is the domain name. In general, sites that end with "edu" (educational sites), "gov" (government sites), or "org" (nonprofit organizations) offer more credible information than sites that end with "com" (commerical sites trying to sell something).
Add site:Edu to your search to focus on educational web sites:
That search will find only college and university web sites about the weapons of the Crusades.
>Here are some special search engines that limit your searches to credible sites:
IPL2—works like Yahoo, but finds mostly quality sites discovered by librarians.
>Google your topic along with the keyword "library guide" or "libguide". This will lead you to library web sites about your topic, and librarians generally list only high-quality sites on their pages!