Slavery and the numbers game : a critique of Time on the cross /
Herbert G. Gutman.
- Urbana : University of Illinois Press, 1975
- xi, 183 p. : ill. ; 23 cm.
- Blacks in the New World .
Fogel, Robert William. Time on the cross.
Slavery in the United States--Economic aspects Slavery in the United States--Condition of slaves .--United States Slavery--Econometric models.--United States