Não informado. (2001). Annual Report of the Massachusetts Extension Service. Massachusetts Extension Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Annual Report of the Massachusetts Extension Service. Amherst, Mass: Massachusetts Extension Service, 2001.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Annual Report of the Massachusetts Extension Service. Massachusetts Extension Service, 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.