APA (7th ed.) Citation

United States. National Geospatial-Intelligence Agency. (2004). Sailing directions (enroute): Philippine Islands (6th ed.). National Geospatial-Intelligence Agency.

Chicago Style (17th ed.) Citation

United States. National Geospatial-Intelligence Agency. Sailing Directions (enroute): Philippine Islands. 6th ed. Bethesda, Md.: National Geospatial-Intelligence Agency, 2004.

MLA (9th ed.) Citation

United States. National Geospatial-Intelligence Agency. Sailing Directions (enroute): Philippine Islands. 6th ed. National Geospatial-Intelligence Agency, 2004.