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