University College of Addis Ababa. Geophysical Observatory & Haile Sellassie I University. Geophysical Observatory. (1959). Bulletin of the Geophysical Observatory. University College Press.
Citação do estilo Chicago (17ª ed.)University College of Addis Ababa. Geophysical Observatory e Haile Sellassie I University. Geophysical Observatory. Bulletin of the Geophysical Observatory. Addis Ababa: University College Press, 1959.
Citação MLA (8ª ed.)University College of Addis Ababa. Geophysical Observatory e Haile Sellassie I University. Geophysical Observatory. Bulletin of the Geophysical Observatory. University College Press, 1959.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.