Não informado. (1976). Illinois Natural History Survey Special Publications. Department of Energy and Natural Resources, Natural History Division.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Illinois Natural History Survey Special Publications. Champaign, Ill: Department of Energy and Natural Resources, Natural History Division, 1976.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Illinois Natural History Survey Special Publications. Department of Energy and Natural Resources, Natural History Division, 1976.
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