调查报告参考1-《Nonprofit needs during COVID-19》,Forefront,1300个样本,3月调查2-《The COVID-19 Crisis and New Jersey’s Non-Profit Community》,Center for Non-Profits,700个样本,3月调查3-《Ohio Nonprofit COVID-19 Survey Report FINAL》,The Ohio State University,7723个样本,4月调查4、5、6-《THE VOICE OF CHARITIES FACING COVID-19 WORLDWIDE》,CAF America,超过1000个样本,3月到6月连续三期调查7-《COVID-19 and Philanthropy:How Giving Behaviors are Shifting Amid Pandemic》,Fidelity Charitable,1842个样本,3月调查