Não informado. Science serves your farm and home. West Virginia Agricultural Experiment Station.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Science Serves Your Farm and Home. Morgantown, Wa. Va: West Virginia Agricultural Experiment Station.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Science Serves Your Farm and Home. West Virginia Agricultural Experiment Station.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.