Não informado. (1950). Rural advisory leaflet. Edinburgh and East of Scotland College of Agriculture.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Rural Advisory Leaflet. Edinburgh, Inglaterra: Edinburgh and East of Scotland College of Agriculture, 1950.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Rural Advisory Leaflet. Edinburgh and East of Scotland College of Agriculture, 1950.
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