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McGhee, George R. Jr; Sheehan, Peter M.; Bottjer, David J.; Droser, Mary L. (2012-02-01). "Ecological ranking of Phanerozoic biodiversity crises: The Serpukhovian (early Carboniferous) crisis had a greater ecological impact than the end-Ordovician". Geology. 40 (2): 147–150. Bibcode:2012Geo....40..147M. doi:10.1130/G32679.1. ISSN0091-7613.
Stanley, Steven M.; Powell, Matthew G. (2003-10-01). "Depressed rates of origination and extinction during the late Paleozoic ice age: A new state for the global marine ecosystem". Geology. 31 (10): 877–880. Bibcode:2003Geo....31..877S. doi:10.1130/G19654R.1. ISSN0091-7613.
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McGhee, George R. Jr; Sheehan, Peter M.; Bottjer, David J.; Droser, Mary L. (2012-02-01). "Ecological ranking of Phanerozoic biodiversity crises: The Serpukhovian (early Carboniferous) crisis had a greater ecological impact than the end-Ordovician". Geology. 40 (2): 147–150. Bibcode:2012Geo....40..147M. doi:10.1130/G32679.1. ISSN0091-7613.
Stanley, Steven M.; Powell, Matthew G. (2003-10-01). "Depressed rates of origination and extinction during the late Paleozoic ice age: A new state for the global marine ecosystem". Geology. 31 (10): 877–880. Bibcode:2003Geo....31..877S. doi:10.1130/G19654R.1. ISSN0091-7613.