Citazione Stile APA (7a Edizione)

Butzer, K. W. (1971). Recent history of an Ethiopian delta: The Omo River and the level of Lake Rudolf. University of Chicago, Dept. of Geography].

Citazione stile Chigago Style (17a edizione)

Butzer, Karl W. Recent History of an Ethiopian Delta: The Omo River and the Level of Lake Rudolf. [Chicago: University of Chicago, Dept. of Geography], 1971.

Citatione MLA (8a ed.)

Butzer, Karl W. Recent History of an Ethiopian Delta: The Omo River and the Level of Lake Rudolf. University of Chicago, Dept. of Geography], 1971.