Citação norma APA

University College of Addis Ababa. Geophysical Observatory & Haile Sellassie I University. Geophysical Observatory. (1959). Bulletin of the Geophysical Observatory. University College Press.

Citação norma Chicago

University College of Addis Ababa. Geophysical Observatory and Haile Sellassie I University. Geophysical Observatory. Bulletin of the Geophysical Observatory. Addis Ababa: University College Press, 1959.

Citação norma MLA

University College of Addis Ababa. Geophysical Observatory and 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.