Brown, Kip; Schwenk, Judith; Bucciarelli, Mark (June 1992). Aids to Navigation Service Force Mix 2000 Project(PDF). Vol. 1. Washington, D.C.: Office of Navigation Safety and Waterways Services, US Coast Guard. pp. H-4.
Brown, Kip; Schwenk, Judith; Buckiarelli, Mark (June 1992). Aids to Navigation Service Force Mix 2000 Project(PDF). Vol. 2. Washington, D.C.: Office of Navigation Safety and Waterway Services, US Coast Guard. pp. 1–15.