Science Buddies: "Ask an Expert"

For background research it is suggested to have at least three sources. Can those three sources be all books or it has to be three different source types like books, journals etc. Also can web pages be considered as sources

Hello Sarsharma,

The sources could be all books, or any combination of books, journal articles, and scientific reports that you find on the web. You will be more likely to find more current reports on the web, since there is always a time lag to get a book published in print.