Sawyer, R. (1986). Slavery in the twentieth century. Routledge & Kegan Paul.
Cita Chicago Style (17a ed.)Sawyer, Roger. Slavery in the Twentieth Century. London [u.a.]: Routledge & Kegan Paul, 1986.
Cita MLA (8a ed.)Sawyer, Roger. Slavery in the Twentieth Century. Routledge & Kegan Paul, 1986.
Precaución: Estas citas no son 100% exactas.