APA (7th ed.) Citation

United States. National Imagery and Mapping Agency. (1999). El Salvador, Honduras, Nicaragua, Scale 1: 500,000, TPC K-25B, July 29, 1987. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. National Imagery and Mapping Agency. El Salvador, Honduras, Nicaragua, Scale 1: 500,000, TPC K-25B, July 29, 1987. [Place of publication not identified]: [publisher not identified], 1999.

MLA (9th ed.) Citation

United States. National Imagery and Mapping Agency. El Salvador, Honduras, Nicaragua, Scale 1: 500,000, TPC K-25B, July 29, 1987. [publisher not identified], 1999.