Não informado. (2008). Illinois Natural History Survey Bulletin. Illinois Natural History Survey.
Style de citation Chicago (17e éd.)Não informado. Illinois Natural History Survey Bulletin. Champaign, Ill: Illinois Natural History Survey, 2008.
Style de citation MLA (8e éd.)Não informado. Illinois Natural History Survey Bulletin. Illinois Natural History Survey, 2008.
Attention : ces citations peuvent ne pas être correctes à 100%.