U.S. Navy Fact File
- Cyclone-class overview.
- http://www.navy.mil/navydata/fact_display.asp?cid=4200&tid=2000&ct=4

Global Security
- Cyclone-class overview, specifications, ship list, plans and schematics, and photos.
- http://www.globalsecurity.org/military/systems/ship/pc-1.htm

Federation of American Scientists
- Cyclone-class Patrol Coastal ship description, specifications, and images.
- http://www.fas.org/man/dod-101/sys/ship/pc-1.htm