The name of the sources I used were PSYCHINFO and PSYCHARTICLES, I selected these sources because these data bases deal only with psychology. These two data bases are very important for my major and contain articles dating back to 1981. I wanted to look at some older studies of psychology so when i used the data bases I adjusted the publishing years to 1981-2000 and searched panic attack disorder. That gave me a lot of articles and the results page seemed to start with the more recently published articles. I really wanted something from the 80’s so i narrowed my searched to articles published in 1981 to 1990. When I found my article I made sure that the article had empirical data from a study conducted during that time period which made it a primary source.