Não informado. Report of the State Zoologist. Geological and Natural History Survey of Minnesota.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Report of the State Zoologist. Minneapolis, Minn: Geological and Natural History Survey of Minnesota.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Report of the State Zoologist. Geological and Natural History Survey of Minnesota.
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