United States. National Imagery and Mapping Agency. (2000). Global navigation and planning chart, GNC (Ed. 12.). The Agency.
Chicago Style (17th ed.) CitationUnited States. National Imagery and Mapping Agency. Global Navigation and Planning Chart, GNC. Ed. 12. [Bethesda, Md.]: The Agency, 2000.
MLA (9th ed.) CitationUnited States. National Imagery and Mapping Agency. Global Navigation and Planning Chart, GNC. Ed. 12. The Agency, 2000.
Warning: These citations may not always be 100% accurate.