Não informado. Report of the State Zoologist. Geological and Natural History Survey of Minnesota.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Report of the State Zoologist. Minneapolis, Minn: Geological and Natural History Survey of Minnesota.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Report of the State Zoologist. Geological and Natural History Survey of Minnesota.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.