One of your first stops while researching a nonprofit is to visit the company's official website: this is an example of a primary source. Secondary sources, such as the ones listed on this page, are typically more reliable and trustworthy because they are unbiased. It is recommended that you research using both primary and secondary sources, and evaluate accordingly.
Don't forget that you can also research nonprofits in OneSearch, the library's discovery tool. Try these search terms: