Larson, D.J. (October 1989). "Revision of north american agabus leach (coleoptera: Dytiscidae): Introduction, key to species groups, and classification of the ambiguus-, tristis-, and arcticus-groups". The Canadian Entomologist. 121 (10): 861–919. doi:10.4039/Ent121861-10. S2CID83948021.
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Larson, D.J. (October 1989). "Revision of north american agabus leach (coleoptera: Dytiscidae): Introduction, key to species groups, and classification of the ambiguus-, tristis-, and arcticus-groups". The Canadian Entomologist. 121 (10): 861–919. doi:10.4039/Ent121861-10. S2CID83948021.
