Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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