APA (7 वां संस्करण) प्रशस्ति पत्र
Nelson, H. D. (1973). Area handbook for the Democratic Republic of Sudan. For sale by the Supt. of Docs., U.S. Govt. Print. Off.].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Nelson, Harold D. Area Handbook for the Democratic Republic of Sudan. Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1973.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Nelson, Harold D. Area Handbook for the Democratic Republic of Sudan. For sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1973.
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