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doi.org
Coddington, Johnathan A.; Colwell, Robert K. (2001). "Arachnids". In Levin, Simon Asher; Colwell, Robert; Daily, Gretchen; Lubchenco, Jane; Mooney, Harold A.; Schulze, Ernst-Detlef; Tilman, G. David (eds.). Encyclopedia of Biodiversity. Vol. 1 (Second ed.). Academic Press. pp. 202–217 [209]. doi:10.1016/B978-0-12-384719-5.00150-7. ISBN978-0-12-384720-1.