Полиестар — разлика између измена

* {{Cite book |ref= harv|last = Rosato|first = Dominick V.|last2 = Rosato|first2 = Donald V.|title = Plastic product material and process selection handbook|publisher = Elsevier|page= 85|year = 2004|url = http://books.google.com/?id=Lqk5QgGoWFkC|isbn = 978-1-85617-431-2|last3 = Rosato|first3 = Matthew V.| ref = harv}}