1976. The Ethiopian Language Area. Language in Ethiopia, ed. by M. Lionel Bender, J. Donald Bowen, Robert Cooper, Charles Ferguson, pp. 63–76. Oxford University
ISBN 978-0-16-081320-7. (原始内容存档于2021-11-17). , Extract p. 41 (页面存档备份,存于互联网档案馆) Bender, David A.; Bender, Arnold Eric. Benders' dictionary of nutrition and food technology