Patrick R. Getty; Robert Sproule; David L. Wagner; Andrew M. Bush. Variation in wingless insect trace fossils: insights from neoichnology and the Pennsylvanian of Massachusetts. PALAIOS. 2013, 28 (4): 243–258. Bibcode:2013Palai..28..243G. S2CID 86430759. doi:10.2110/palo.2012.p12-108r.
Patrick R. Getty; Robert Sproule; David L. Wagner; Andrew M. Bush. Variation in wingless insect trace fossils: insights from neoichnology and the Pennsylvanian of Massachusetts. PALAIOS. 2013, 28 (4): 243–258. Bibcode:2013Palai..28..243G. S2CID 86430759. doi:10.2110/palo.2012.p12-108r.
Patrick R. Getty; Robert Sproule; David L. Wagner; Andrew M. Bush. Variation in wingless insect trace fossils: insights from neoichnology and the Pennsylvanian of Massachusetts. PALAIOS. 2013, 28 (4): 243–258. Bibcode:2013Palai..28..243G. S2CID 86430759. doi:10.2110/palo.2012.p12-108r.