Não informado. Racing Pigeon Bulletin. International Federation of American Homing Pigeon Fanciers.
Chicago-viite (17. p.)Não informado. Racing Pigeon Bulletin. Centerville, Ohio: International Federation of American Homing Pigeon Fanciers.
MLA-viite (8. p.)Não informado. Racing Pigeon Bulletin. International Federation of American Homing Pigeon Fanciers.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.