Citazione Stile APA (7a Edizione)

Nelson, H. D. (1973). Area handbook for the Democratic Republic of Sudan. U.S. Government Printing Office.

Citazione stile Chigago Style (17a edizione)

Nelson, Harold D. Area Handbook for the Democratic Republic of Sudan. Washington, D.C: U.S. Government Printing Office, 1973.

Citatione MLA (9a ed.)

Nelson, Harold D. Area Handbook for the Democratic Republic of Sudan. U.S. Government Printing Office, 1973.