APA

WILLIS J. R., . (1985). Slaves and Slavery in Muslim Africa. II. Londres: Frank Cass.

Chicago

WILLIS John Ralph, . 1985. Slaves and Slavery in Muslim Africa. II. Londres: Frank Cass.

Harvard

WILLIS J. R., . (1985). Slaves and Slavery in Muslim Africa. II. Londres: Frank Cass.

MLA

WILLIS John Ralph, . Slaves and Slavery in Muslim Africa. II. Londres: Frank Cass. 1985.