Getty, Patrick R.; Robert Sproule; Wagner, David L.; Bush, Andrew M. (2013). „Variation in wingless insect trace fossils: insights from neoichnology and the Pennsylvanian of Massachusetts”. PALAIOS. 28 (4): 243—258. Bibcode:2013Palai..28..243G. S2CID86430759. doi:10.2110/palo.2012.p12-108r.
Getty, Patrick R.; Robert Sproule; Wagner, David L.; Bush, Andrew M. (2013). „Variation in wingless insect trace fossils: insights from neoichnology and the Pennsylvanian of Massachusetts”. PALAIOS. 28 (4): 243—258. Bibcode:2013Palai..28..243G. S2CID86430759. doi:10.2110/palo.2012.p12-108r.
Getty, Patrick R.; Robert Sproule; Wagner, David L.; Bush, Andrew M. (2013). „Variation in wingless insect trace fossils: insights from neoichnology and the Pennsylvanian of Massachusetts”. PALAIOS. 28 (4): 243—258. Bibcode:2013Palai..28..243G. S2CID86430759. doi:10.2110/palo.2012.p12-108r.