Não informado. (1946). Extension service news. Virginia Polytechnic Institute, Agricultural Extension Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Extension Service News. Blacksburg, Va: Virginia Polytechnic Institute, Agricultural Extension Service, 1946.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Extension Service News. Virginia Polytechnic Institute, Agricultural Extension Service, 1946.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.