University College of Addis Ababa. Geophysical Observatory & Haile Sellassie I University. Geophysical Observatory. (1959). Bulletin of the Geophysical Observatory. University College Press.
Style de citation Chicago (17e éd.)University College of Addis Ababa. Geophysical Observatory et Haile Sellassie I University. Geophysical Observatory. Bulletin of the Geophysical Observatory. Addis Ababa: University College Press, 1959.
Style de citation MLA (8e éd.)University College of Addis Ababa. Geophysical Observatory et Haile Sellassie I University. Geophysical Observatory. Bulletin of the Geophysical Observatory. University College Press, 1959.
Attention : ces citations peuvent ne pas être correctes à 100%.