Buatois, L.A.; Mángano, M.G.; Maples, C.G; Lanier, W.P. (1998). "Ichnology of an Upper Carboniferous fluvio-estuarine paleovalley: The Tonganoxie sandstone, Buildex quarry, eastern Kansas, USA". Journal of Paleontology. 72 (1): 152–180. Bibcode:1998JPal...72..152B. doi:10.1017/S0022336000024094. S2CID140690638.
Wang, Y.; Lin, J. P.; Zhao, Y. L.; Orr, P. J. (2009). "Palaeoecology of the trace fossil Gordia and its interaction with nonmineralizing taxa from the early Middle Cambrian Kaili Biota, Guizhou Province, South China". Palaeogeography, Palaeoclimatology, Palaeoecology. 277 (1–2): 141–148. Bibcode:2009PPP...277..141W. doi:10.1016/j.palaeo.2009.02.017.
Buatois, L.A.; Mángano, M.G.; Maples, C.G; Lanier, W.P. (1998). "Ichnology of an Upper Carboniferous fluvio-estuarine paleovalley: The Tonganoxie sandstone, Buildex quarry, eastern Kansas, USA". Journal of Paleontology. 72 (1): 152–180. Bibcode:1998JPal...72..152B. doi:10.1017/S0022336000024094. S2CID140690638.
Wang, Y.; Lin, J. P.; Zhao, Y. L.; Orr, P. J. (2009). "Palaeoecology of the trace fossil Gordia and its interaction with nonmineralizing taxa from the early Middle Cambrian Kaili Biota, Guizhou Province, South China". Palaeogeography, Palaeoclimatology, Palaeoecology. 277 (1–2): 141–148. Bibcode:2009PPP...277..141W. doi:10.1016/j.palaeo.2009.02.017.