Não informado. (2008). Illinois Natural History Survey Bulletin. Illinois Natural History Survey.
Chicagoスタイル(17版)引用形式Não informado. Illinois Natural History Survey Bulletin. Champaign, Ill: Illinois Natural History Survey, 2008.
MLA(8版)引用形式Não informado. Illinois Natural History Survey Bulletin. Illinois Natural History Survey, 2008.
警告: この引用は必ずしも正確ではありません.