1. Aw BY, Roberts MJ, Winston T. (2007). Export market participation, investments in R&D and worker training, and the evolution of firm productivity. World Economy, 30, 83-104.
2. Barden Ph. Innovations. The basics of innovation, Strategic Directions, 2008, 24 (2), 29-31.
3. Brousell DR. 2008, The Innovation Gap, Managing Automation, retrieved aug. 2013 www.managingautomation.com/maonline/magazine/read/view/The_Innovation_Gap_27754973?page=1.
4. Brown, S., Manufacturing seniority, strategy and innovation, Technovation, 1998, 18(3), 149-162.
5. CISCO White Paper Manufacturing Innovation: Transforming Manufacturing Product and Service Innovation With People, Process, and Technology retrieved aug. 2013 www.cisco.com/web/strategy/docs/manufacturing/innov_in_manf_whitepaper.pdf.