The majority of your research for assignments in Dr. Putman's CAS 100A class should come from publications that Dr. Putman describes as the "Big Four":

• academic books
• reputable magazine articles (i.e. Time, Forbes, or U.S. News & World Report)
• newspapers/credible news-based sites (i.e. New York Times, CNN or MSNBC)
• academic journals

Additionally, only one unique website can be used as a source that counts toward the minimum number of required sources. Typically these site domains are .org, .gov, or other .com sites that are not from the "Big Four."