Não informado. Racing Pigeon Bulletin. International Federation of American Homing Pigeon Fanciers.
Chicago-referens (17:e uppl.)Não informado. Racing Pigeon Bulletin. Centerville, Ohio: International Federation of American Homing Pigeon Fanciers.
MLA-referens (8:e uppl.)Não informado. Racing Pigeon Bulletin. International Federation of American Homing Pigeon Fanciers.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.