If this was an article about a company rather than a charity, I think it would be common practice to cite the company's Form 10-K filing to establish basic financial parameters such as revenue, profit, etc. I think no one would question inclusion of such a reference. The Form 990 seems to be the same kind of concept, as it applies to charities, so I guess I no longer object to referencing it (especially after seeing that it reports assets as well as gross receipts). I still somewhat wonder whether there might be some other similarly named charity that is not the U.S. charity that might be a larger operation, but we don't seem to have any indication of that – it is merely exploratory speculation at this point. —