1. Garretson, Peter Phillips. 1974. “‘A History of Addis Ababa from its Foundation in 1886 to 1910’”. University of London. unpublished PhD thesis,
2. Horvath, Ronald J. 1966. “‘Around Addis Ababa: A Geographical Study of the Impact of a City on its Surroundings’”. Los Angeles: University of California. unpublished PhD thesis,
3. Michael, Akalou Wolde. 1967. “‘Urban Development in Ethiopia in Time and Space Perspective’”. Los Angeles: University of California. unpublished PhD thesis,
4. Mariam, Tekalign W. ‘Notes on Intoto: The Precursor of Addis Ababa (1881–1892)’. Proceedings of the Fourth Seminar of the Department of History. pp.133–152. Addis Ababa: Addis Ababa University.