Use the "Find Articles, Books, & More" box at the top of the page with your topic and "public relations", then refine your results, e.g., Content Type, Subject Terms, Date, Language.

To find a case, read the mainstream newspapers as well as the public relations trade publications (eg PR Week, The Strategist etc) to find some current PR “situation.”

SWOT or TOWS = Strengths, Weaknesses, Opportunities, Threats. Analyzing these qualities provides a good overview of companies' current & future prospects. 

By analyzing the external environment (threats & opportunities), & your company internal environment (weaknesses & strengths), you can think about the strategies of your organization, department, team, a process, or public relations.

If you can't find a SWOT analysis for a company, look at a competitor or an industry analysis: the factors are often similar for companies in the same industry.