APA (7th ed.) Citation

Great Britain. Foreign Office. Historical Section. (1920). Eritrea. H.M.S.O..

Chicago Style (17th ed.) Citation

Great Britain. Foreign Office. Historical Section. Eritrea. London: H.M.S.O., 1920.

MLA (8th ed.) Citation

Great Britain. Foreign Office. Historical Section. Eritrea. H.M.S.O., 1920.