Citazione Stile APA (7a Edizione)

Nelson, H. D. (1972). Area handbook for Chad. U.S. Government Printing Office.

Citazione stile Chigago Style (17a edizione)

Nelson, Harold D. Area Handbook for Chad. Washington, D.C: U.S. Government Printing Office, 1972.

Citatione MLA (9a ed.)

Nelson, Harold D. Area Handbook for Chad. U.S. Government Printing Office, 1972.