Não informado. (1956). Research for farmers. Department of Agriculture.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Research for Farmers. Ottawa: Department of Agriculture, 1956.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Research for Farmers. Department of Agriculture, 1956.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.