Frances R. Hill & Douglas M. Mancino, Taxation of Exempt Organizations (Warren, Gorham & Lamont) [on WESTLAW: WGL-TEO].
Bruce R. Hopkins, The Tax Law of Charitable Giving (4th ed., John Wiley & Sons 2010) [on Lexis: https://lib.byu.edu/search/law/record/cat.7524156.item.7524156-1001?holding=imhe9w7mzl28jhyi].
Publication 526: Charitable Contributions (IRS January 2012) [html pdf].
Publication 557: Tax-Exempt Status for Your Organization (IRS October 2011) [html pdf].
Publication 598: Tax on Unrelated Business Income of Exempt Organizations (IRS March 2012) [html pdf].
Tax Information for Charities & Nonprofits (IRS, last updated Dec. 2023) (IRS links to training, resources and sub-topics, including charitable organizations, churches and religious organizations, contributors, other non-profits, political organizations, and private foundations). See: https://www.irs.gov/charities-and-nonprofits
Utah Domestic Non-Profit Corporation (Utah Division of Corporations and Commercial Code, last updated 2012) (Utah links to online services, nonprofit laws, forms, guide sheets, informational packets, frequently asked questions, and other information & websites). See: http://corporations.utah.gov/business/dnp.html