BioStor
 | On Two New Species of Onychophora from the Siamese Malay States Richard Evans (1901) Quarterly journal of microscopical science 44: 473-538 |
 | A revision of the American species of Peripatus Austin Hobart Clark (1913) Proceedings of the Biological Society of Washington 26: 15-20 |
 | Onychophora. Zoological results of the Abor expedition, 1911-1912 Stanley Kemp (1914) Records of the Indian Museum 8: 471-492 |
 | 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 |