Style de citation APA (7e éd.)

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

Style de citation Chicago (17e éd.)

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

Style de citation MLA (8e éd.)

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

Attention : ces citations peuvent ne pas être correctes à 100%.