Não informado. (2001). Annual report of the Grassland Research Institute. Grassland Research Institute.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Annual Report of the Grassland Research Institute. Berkshire, Inglaterra: Grassland Research Institute, 2001.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Annual Report of the Grassland Research Institute. Grassland Research Institute, 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.