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Mayr, Gerald; Peters, Stefan D.; Plodowski, Gerhard; Vogel, Olaf (1 Ağustos 2002). "Bristle-like integumentary structures at the tail of the horned dinosaur Psittacosaurus". Naturwissenschaften (İngilizce). 89 (8): 361-365. doi:10.1007/s00114-002-0339-6. ISSN0028-1042. PMID12435037.
Qi, Zhao; Barrett, Paul M.; Eberth, David A. (1 Eylül 2007). "Social Behaviour and Mass Mortality in the Basal Ceratopsian Dinosaur Psittacosaurus (early Cretaceous, People's Republic of China)". Palaeontology (İngilizce). 50 (5): 1023-1029. doi:10.1111/j.1475-4983.2007.00709.x. ISSN1475-4983.
Mayr, Gerald; Peters, Stefan D.; Plodowski, Gerhard; Vogel, Olaf (1 Ağustos 2002). "Bristle-like integumentary structures at the tail of the horned dinosaur Psittacosaurus". Naturwissenschaften (İngilizce). 89 (8): 361-365. doi:10.1007/s00114-002-0339-6. ISSN0028-1042. PMID12435037.