1. Helmold, M., & Terry, B. (2016). Global sourcing and supply management excellence in China. Springer.
2. Helmold, M., et al. (2020). Successful international negotiations. A practical guide for managing transactions and deals. Springer.
3. Kotler, P., & Armstrong, G. (2018). Principles of marketing (17. Aufl.). Pearson.
4. Liker, J. K. (2004). The Toyota way. McGraw-Hill.
5. Ohno, T. (1990). Toyota production system. Beyond large scale production. Productivity Press.