Goodwin, Mark B.; Evans, David C. (2016-02-06). «The early expression of squamosal horns and parietal ornamentation confirmed by new end-stage juvenilePachycephalosaurusfossils from the Upper Cretaceous Hell Creek Formation, Montana». Journal of Vertebrate Paleontology36 (2): e1078343. doi:10.1080/02724634.2016.1078343. ISSN0272-4634.
worldcat.org
Goodwin, Mark B.; Evans, David C. (2016-02-06). «The early expression of squamosal horns and parietal ornamentation confirmed by new end-stage juvenilePachycephalosaurusfossils from the Upper Cretaceous Hell Creek Formation, Montana». Journal of Vertebrate Paleontology36 (2): e1078343. doi:10.1080/02724634.2016.1078343. ISSN0272-4634.