APA (7e ed.) Bronvermelding

Não informado. (1959). Bulletin of the Geophysical Observatory. Haile Selassie i University.

Chicago (17e ed.) Bronvermelding

Não informado. Bulletin of the Geophysical Observatory. Addis Ababa: Haile Selassie i University, 1959.

MLA (8e ed.) Bronvermelding

Não informado. Bulletin of the Geophysical Observatory. Haile Selassie i University, 1959.

Let op: Deze citaties zijn niet altijd 100% accuraat.