^As attested, for example, by Matt Philips and Jean-Bernard Carillet, Ethiopia and Eritrea, third edition (n.p.: Lonely Planet, 2006), p.251
^Donald Donham includes Sayo as one of the "strictly limited" number of local domains that were permitted a degree of independence in return for accepting the rule of Emperor Menelik II. Donham, "The making of an imperial state" in The Southern Marches of Imperial Ethiopia, Donald Donham and Wendy James, editors (Oxford: James Currey, 2002) p. 37
^Richard Pankhurst, Economic History of Ethiopia (Addis Ababa (Finfinne): Haile Selassie I University, 1968), p. 450