2020-7-23 · Complete Recycling LLC, "Plastic Recycling and Resin Identification Codes" Scranton Products, "Different Types of Plastic and SPI Codes Used to Classify Them" Miller, Clay, Ways 2 Go Green, "Plastic Recycling & Plastic Identification Codes" Earth Easy, "Plastic by the Numbers" Willis, Amanda, Earth 911, "The Ultimate Plastic Breakdown"