Não informado. (1968). Farm buildings digest. Farm Buildings Information Centre.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Farm Buildings Digest. Kenilworth, Inglaterra: Farm Buildings Information Centre, 1968.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Farm Buildings Digest. Farm Buildings Information Centre, 1968.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.