1. A. D. Chapman Numbers of Living Species in Australia and the World http://www.environment.gov.au/biodiversity/abrs/publications/other/species-numbers/08-references.html
2. http://evolution.berkeley.edu/evolibrary/article/O_O_O/arthropods_09
3. R. B. Halliday, Mites http://www.australasian-arachnology.org/arachnology/acari
4. Evolutionary Morphology and Phylogeny of Arachnida;Shultz;Cladistics,1990