APA (7th ed.) Citation

United States. National Ocean Service. (1981). Airport obstruction chart (8th ed., field surveys Jan. 1981, published Aug. 1981.). The Service.

Chicago Style (17th ed.) Citation

United States. National Ocean Service. Airport Obstruction Chart. 8th ed., field surveys Jan. 1981, published Aug. 1981. Washington, D.C.: The Service, 1981.

MLA (9th ed.) Citation

United States. National Ocean Service. Airport Obstruction Chart. 8th ed., field surveys Jan. 1981, published Aug. 1981. The Service, 1981.