"Newport Aquarium's Sweet Pea, the First Documented Shark Ray to Breed in Captivity, Gives Birth to Seven Pups".
2009년 1월 22일에 확인함.  “Newport Aquarium’s Sweet Pea, the First Documented Shark Ray to Breed in Captivity, Gives Birth to Seven Pups”. 《Aquarium Works》 (Newport Aquarium).