Não informado. (2001). Studies from the Department of Zoology. University of Nebraska.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Studies from the Department of Zoology. Lincoln, Neb: University of Nebraska, 2001.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Studies from the Department of Zoology. University of Nebraska, 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.