Bacon, Elizabeth E. Obok : a study of social structure in Eurasia. - New York : Wenner-Gren Foundation for Anthropological Research, 1958. - Viking Fund publications in anthropology ; no. 25 . Bibliography: p. 217-223. LCCN: 58001328 Subjects--Topical Terms: Tribes. LC Class. No.: GN490 / .B3 Dewey Class. No.: 572