ስራዎቹ
- 1) Ethiopia and the Bible: The Schweich Lectures 1967 1968
- 2) Ethiopia and the Bible 1971
- 3) Ethiopians an Introduction to Country and People 1973
- 4) Studia Aethiopica et Semitica 1987
- 5) An Amharic Chrestomathy.. 1988
- 6) The two Zions 1988
- 7) From Emperor Haile Selassie to H.J. Polotsky 1995
