1. 3D printing industry. The free beginner’s guide. Access on Oct 27, 2017. https://3dprintingindustry.com/3d-printing-basics-free-beginners-guide#02-history .
2. Norman J, Madurawe RD, Moore CM, Khan MA, Khairuzzaman A. A new chapter in pharmaceutical manufacturing: 3D-printed drug products. Adv Drug Deliv Rev. 2017;108:39–50.
3. McCue TJ. Wohlers Report: 3D printing industry surpassed $5.1 billion. Forbes. 2016. https://www.forbes.com/sites/tjmccue/2016/04/25/wohlers-report-2016-3d-printer-industry-surpassed-5-1-billion/#3cff22c719a0 . April 25, 2016.
4. As 3-D printing emerges from prototyping to assume a role in mass manufacturing and production, the industry must adapt, PWC 30, 2017. Access on Oct 27, 2017. http://usblogs.pwc.com/emerging-technology/5-ways-3d-printing-revolutionizes-manufacturing/
5. Hollander J, Natalja G, Harri J, Mohammad K, Ari R, Ermei M, et al. Three-dimensional printed PCL-based implantable prototypes of medical devices for controlled drug delivery. J Pharm Sci. 2016;105:2665–76.