There are many resources you can use to locate internships. A good place to start is with WJC Career Services. On the Career Services web site you can sign-up for e-recruiting and receive emailed information about internships in your field. You can also research internships and do a search for internship positions on their web site.
There are also several professional communication organizations in Kansas City. They provide excellent career networking opportunities and have internship directories posted on their web site.
Public Relations Society of America
American Advertising Federation
International Association of Business Communicators
Another strategy for seeking internships is to research organizations where you would like to work. Many post internship information on their web-sites.