Listas http://www.ru.ac.za/departments/zooento/Martin/protura.html
http://www.york.biosis.org/zrdocs/taxhier/hier_13a.htm
http://www.york.biosis.org/zrdocs/zoolinfo/grp_neur.htm
http://www.isis.vt.edu/~fanjun/text/Link_clas2.html
http://www.ru.ac.za/departments/zooento/Martin/protura.html
Link`s http://ag.arizona.edu/ENTO/tree/eukaryotes/animals/arthropoda/hexapoda/protura/protura.html
http://www.cnr.berkeley.edu/explore/Taxa/Hexopoda/SubphylumHexopodaAssociatedTaxa.htm
Chaves http://www.biol.uni.torun.pl/~konrad/e_klucz.htm