United States. Defense Mapping Agency. Hydrographic/Topographic Center. (1991). South America, Ecuador, Approaches to Estero Salado and Puerto Marítimo de Guayaquil (6th ed., July 27, 1991 (Correct through NM 30/91).). The Center.
Chicago Style (17th ed.) CitationUnited States. Defense Mapping Agency. Hydrographic/Topographic Center. South America, Ecuador, Approaches to Estero Salado and Puerto Marítimo De Guayaquil. 6th ed., July 27, 1991 (Correct through NM 30/91). Washington, D.C.: The Center, 1991.
MLA (9th ed.) CitationUnited States. Defense Mapping Agency. Hydrographic/Topographic Center. South America, Ecuador, Approaches to Estero Salado and Puerto Marítimo De Guayaquil. 6th ed., July 27, 1991 (Correct through NM 30/91). The Center, 1991.
Warning: These citations may not always be 100% accurate.