APA

Feldstein M., Clotfelter C., .Tax incentives and charitable contributions in the United States. : .

Chicago

Feldstein Martin, Clotfelter Charles, .Tax incentives and charitable contributions in the United States. : .

Harvard

Feldstein M., Clotfelter C., .Tax incentives and charitable contributions in the United States. : .

MLA

Feldstein Martin, Clotfelter Charles, .: . .