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John RJ.R.HornerJohn RJ.R., Mark BM.B.GoodwinMark BM.B., Major cranial changes during Triceratops ontogeny, „Proceedings. Biological sciences”, 273 (1602), 2006, s. 2757–61, DOI: 10.1098/rspb.2006.3643, PMID: 17015322, PMCID: PMC1635501(ang.).