Nelson, H. D. (1972). Area handbook for Nigeria. U.S. Government Printing Office.
Chicagoスタイル(17版)引用形式Nelson, Harold D. Area Handbook for Nigeria. Washington, D.C: U.S. Government Printing Office, 1972.
MLA(9版)引用形式Nelson, Harold D. Area Handbook for Nigeria. U.S. Government Printing Office, 1972.
警告: この引用は必ずしも正確ではありません.