United States. National Imagery and Mapping Agency. (1999). Cameroon, Chad, Niger, Nigeria, Scale 1: 500,000, TPC K-3B, September 14, 1988. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. National Imagery and Mapping Agency. Cameroon, Chad, Niger, Nigeria, Scale 1: 500,000, TPC K-3B, September 14, 1988. [Place of publication not identified]: [publisher not identified], 1999.
MLA (9th ed.) CitationUnited States. National Imagery and Mapping Agency. Cameroon, Chad, Niger, Nigeria, Scale 1: 500,000, TPC K-3B, September 14, 1988. [publisher not identified], 1999.
Warning: These citations may not always be 100% accurate.