Não informado. (2000). Research and Farming. North Carolina Agricultural Experiment Station.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Research and Farming. Raleigh, NC: North Carolina Agricultural Experiment Station, 2000.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Research and Farming. North Carolina Agricultural Experiment Station, 2000.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.