Matt Ryan (2017-02-08). “Ichnology of the Devonian (Emsian) Campbellton Formation, NewBrunswick, Canada”. Atlantic Geology 53: 001–015. doi:10.4138/atlgeol
Matt Ryan (2017-02-08). “Ichnology of the Devonian (Emsian) Campbellton Formation, NewBrunswick, Canada” (英語). Atlantic Geology 53: 001–015. doi:10.4138/atlgeol