McKeever, B. (2018). The nonprofit sector in brief 2018. Urban Institute. National Center for Charitable Institutes. Statistical information about nonprofits since 2005.
Muslic, H. (2017). A brief history of nonprofit organizations (and what we can learn). Essential Nonprofit Library. Discussion on the history of nonprofits.
Powell, W. W., & Bromley, P. (2020). The nonprofit sector: A Research Handbook, Third Edition: Vol. Third edition. Stanford University Press. Read Chapter Two – it discusses the history of nonprofits.
Renz, D. O. (2016). The Jossey-Bass handbook of nonprofit leadership and management. Read Chapter One which discusses the history of nonprofit organizations.