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Peck, O. 1963, A catalogue of the Nearctic Chalcidoidea (Insecta; Hymenoptera). Canadian Entomologist (Supplement) 30:494-497
Ward, R.H.; Pienkowski, R.L. 1978, Mortality and parasitism of Cassida rubiginosa a thistle-feeding shield beetle accidentally introduced into North America. Environmental Entomology 7(4):536-540