Christy, D. (1850). A lecture on African civilization: Including a brief outline of the social and moral condition of Africa : and the relations of American slavery to African civilization : delivered in the hall of the House of Representatives of the state of Ohio, January 19, 1850. Cincinnati: printed by J.A. & U.P. James.

Christy, David. A Lecture On African Civilization: Including a Brief Outline of the Social and Moral Condition of Africa : And the Relations of American Slavery to African Civilization : Delivered in the Hall of the House of Representatives of the State of Ohio, January 19, 1850. Cincinnati: printed by J.A. & U.P. James, 1850.

Christy, David. A Lecture On African Civilization: Including a Brief Outline of the Social and Moral Condition of Africa : And the Relations of American Slavery to African Civilization : Delivered in the Hall of the House of Representatives of the State of Ohio, January 19, 1850. Cincinnati: printed by J.A. & U.P. James, 1850.