1. Biesel, H., & Hame, H. (2018). Sales and marketing in the digital world. Wiesbaden: Springer Gabler.
2. Binckebanck, L., & Elste, R. (2016). Digitization in distribution. Wiesbaden: Springer Gabler.
3. Dhillon, B. S. (2016). Computer system reliability: Safety and usability. Boca Raton, FL: CRC Press.
4. Hannig, U. (2017). Marketing and sales automation. Wiesbaden: Springer Gabler.
5. Hofmaier, R. (2015). Marketing, sales and customer management. Berlin: Walter de Gruyter.