Não informado. (2002). Report of the Breeding and Production Organisation. Milk Marketing Board.
Chicago-referens (17:e uppl.)Não informado. Report of the Breeding and Production Organisation. Thames Ditton, Inglaterra: Milk Marketing Board, 2002.
MLA-referens (8:e uppl.)Não informado. Report of the Breeding and Production Organisation. Milk Marketing Board, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.