(1979). A geological map of Ethiopia and Somalia, 1973: And comment with a map of "major landforms" = Carta geologica dell'Etiopia e della Somalia = Warqadda cilmiga dhulka ee Itoobiya iyo Soomaliya. Pergamon Pr.
Chicago-Zitierstil (17. Ausg.)A Geological Map of Ethiopia and Somalia, 1973: And Comment with a Map of "Major Landforms" = Carta Geologica Dell'Etiopia E Della Somalia = Warqadda Cilmiga Dhulka Ee Itoobiya Iyo Soomaliya. Oxford: Pergamon Pr, 1979.
MLA-Zitierstil (9. Ausg.)A Geological Map of Ethiopia and Somalia, 1973: And Comment with a Map of "Major Landforms" = Carta Geologica Dell'Etiopia E Della Somalia = Warqadda Cilmiga Dhulka Ee Itoobiya Iyo Soomaliya. Pergamon Pr, 1979.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.