Cita APA (7th ed.)

Grühl, M. (1932). The citadel of Ethiopia: The empire of the divine emperor. Cape.

Cita Chicago (17th ed.)

Grühl, Max. The Citadel of Ethiopia: The Empire of the Divine Emperor. London: Cape, 1932.

Cita MLA (8th ed.)

Grühl, Max. The Citadel of Ethiopia: The Empire of the Divine Emperor. Cape, 1932.