text: | author = George C. Blasiola | title = Koi: everything about selection, care, nutrition, diseases, breeding, pond design and maintenance, and popular aquatic plants | location= Hauppauge, New York | publisher=Barron's Educational Series | year = 1995 | author = David Twigg | title = How to Keep Koi | location= New York | publisher=Howell Book House | year = 2001