Cita APA (7a ed.)
Higgins, C., & Coombs, O. (1976). Some time ago: A historical portrait of black americans from 1850-1950. Anchor Press.
Cita Chicago Style (17a ed.)
Higgins, Chester, y Orde Coombs. Some Time Ago: A Historical Portrait of Black Americans from 1850-1950. New York: Anchor Press, 1976.
Cita MLA (9a ed.)
Higgins, Chester, y Orde Coombs. Some Time Ago: A Historical Portrait of Black Americans from 1850-1950. Anchor Press, 1976.
Precaución: Estas citas no son 100% exactas.