플라스틱
웨이백 머신 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EC%9B%A8%EC%9D%B4%EB%B0%B1_%EB%A8%B8%EC%8B%A0Plastics Consultancy Network - Periodic Table of Polymers
https://web.archive.org/web/20080703034726/http://www.pcn.org/Technical%20Notes%20-%20Periodic%20Table%20of%20Polymers.htm#Periodic Table of Polymers - Plastics Consultancy Network
http://www.pcn.org/Technical%20Notes%20-%20Periodic%20Table%20of%20Polymers.htm