Students are still working on the assignment about the financial situation of the Yankee's baseball team. In addition to the sources listed in previous posts to this blog, I'd like to suggest that many books have been written on the topic of the economics of sports and they are available in CUNY libraries.
LC subject headings include:
Major League Baseball (Organization)
Baseball--Economic Aspects--United States
You might be surprised to see that Brookings has published several titles on this topic. We have their books: May the Best Team Win: Baseball Economics and Public Policy, and Sports, Jobs, and Taxes : the Economic Impact of Sports Teams and Stadiums.
In addition there is a business database devoted to the sports industry available at SIBL. It is the Sports Business Research Network. It includes statistical market research data for 63 sports, 85 product categories, plus full-text articles and reports in more than 10 leading trade publications covering U.S. and international sports marketing and sporting goods business.