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Proton Proton (họ tên lửa) Protoceratops Protohadros Protodioscin ProtonVPN Prototype (Framework JavaScript) Protoplanet Prototype (công ty) Protolampra brunneicollisTài liệu tham khảo
WikiPedia: Protoceratops http://www.gondwanastudios.com/info/pro.htm http://www.users.qwest.net/~jstweet1/ceratopia.htm http://digitallibrary.amnh.org/dspace/bitstream/22... http://www.amnh.org/exhibitions/fightingdinos/vide... http://dallasdino.org/exhibits/dinoworld/Protocera... http://vertpaleo.org/publications/jvp/15-576-591.c... https://web.archive.org/web/20060219082923/http://... https://web.archive.org/web/20070903084253/http://... https://web.archive.org/web/20071117132451/http://... https://commons.wikimedia.org/wiki/Category:Protoc...