Sudan Projects & Designs Office. (1928). Problem of the Upper Nile: Map of the Bahr el-Gebel. [Place of publication not identified]: Sudan Projects & Designs Office.
استشهاد بنمط شيكاغوSudan Projects & Designs Office. Problem of the Upper Nile: Map of the Bahr El-Gebel. [Place of publication not identified]: Sudan Projects & Designs Office, 1928.
MLA استشهادSudan Projects & Designs Office. Problem of the Upper Nile: Map of the Bahr El-Gebel. [Place of publication not identified]: Sudan Projects & Designs Office, 1928.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.