Standardization Administration of the People’s Republic of China (SAC) GB 16288-2008. Marking of plastics products 塑料制品的标志. Chinese Standard Publishing House, Beijing; 2008, as cited in E. J. Hunt, C. Zhang, N.Anzalone, and J. M. Pearce. Polymer Recycling Codes for Distributed Manufacturing with 3-D Printers, Resources, Conservation and Recycling 97, pp. 24–30 (2015). doi:10.1016/j.resconrec.2015.02.004
