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Guerrero-Casado, José; Monge-Nájera, Julián (16 November 2022). "Bibliometrics of velvet worm (Onychophora) research: geographic and historical trends over 150 years, and recommendations for future work". Biologia. 78 (1): 109–117. Bibcode:2022Biolg..78..109G. doi:10.1007/s11756-022-01221-5.
New Zealand peripatus/ngaokeoke : current knowledge, conservation and future research needs. New Zealand. Department of Conservation, New Zealand. Department of Conservation, Ōtepoti/Dunedin Office. 2014. ISBN9780478150094. OCLC994631114.{{cite book}}: CS1 maint: others (link)