BioStor
 | Classification of Insects. A key to the known families of insects and other terrestrial arthropods. [1st Edition] C T Brues and A L Melander (1932) Bulletin of the Museum of Comparative Zoology 73: 1-672 |
 | A systematic revision and the evolutionary biology of the Ptomaphagus (Adelops) beetles of North America (Coleoptera; Leiodidae; Catopinae), with emphasis on cave-inhabiting species S B Peck (1973) Bulletin of The Museum of Comparative Zoology 145: 29-162 |