Tribes without rulers : studies in African segmentary systems / Laura Bohannan ... [et al.] . edited by John Middleton and David Tait. Middleton, John, 1921- ed. Tait, David, ed. Bohannan, Laura. Political anthropology. GN490 .M5 572 MIT London : Routledge & Paul, 1958. 1958. 1958 Text xi, 234 p. : eng