Não informado. (1950). Rural advisory leaflet. Edinburgh and East of Scotland College of Agriculture.
Chicago-referens (17:e uppl.)Não informado. Rural Advisory Leaflet. Edinburgh, Inglaterra: Edinburgh and East of Scotland College of Agriculture, 1950.
MLA-referens (8:e uppl.)Não informado. Rural Advisory Leaflet. Edinburgh and East of Scotland College of Agriculture, 1950.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.