Não informado. (1967). Farm Building News. American Farm Building Services.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Farm Building News. Iola, Wis: American Farm Building Services, 1967.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Farm Building News. American Farm Building Services, 1967.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.