- APHSA (American Public Human Services Association)www.aphsa.org
- National Center for Charitable Statisticswww.urban.org
- Library of Congress — “The Nonprofit Sector in the United States: A Resource Guide”www.guides.loc.gov
- ICNL – Resources for U.S. Nonprofitswww.icnl.org
- Administration for Children & Families (ACF)www.acf.gov
