University College of Addis Ababa. Geophysical Observatory & Haile Sellassie I University. Geophysical Observatory. (1959). Bulletin of the Geophysical Observatory. University College Press.
Čikaški stil citiranja (17. izdanje)University College of Addis Ababa. Geophysical Observatory i Haile Sellassie I University. Geophysical Observatory. Bulletin of the Geophysical Observatory. Addis Ababa: University College Press, 1959.
MLA način citiranja (8. izdanje)University College of Addis Ababa. Geophysical Observatory i Haile Sellassie I University. Geophysical Observatory. Bulletin of the Geophysical Observatory. University College Press, 1959.
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