Cao da Serra de Aires, Portuguese Sheepdog - Breed description and pictures presented by the American Rare Breed Association. www.arba.org/Breed%20Standards/Cao-da-Serra-de-Aires-Standard.htm
DogBreedInfo: Cao da Serra de Aires - Profile of the breed also known as the Serra de Aires Mountain Dog. www.dogbreedinfo.com/caodaserradeaires.htm
FCI-Standard No 93 - FCI-standard of the Cao da Serra de Aires, Portuguese Sheepdog. www.bestdogs.com/UK/std/93UK.htm
