1. Aaker D (2013) Competitor Analysis. Strategic market management, 10th edn. Wiley, New York, pp 40–58
2. Achleitner A-K, Bassen A (2002) Controllingsysteme in jungen Wachstumsunternehmen - terra incognita. Betriebs-Berater 57(23):1192–1198
3. Aguilar FJ (1967) Scanning the business environment. Macmillan, New York
4. Al-Debei MM, Avison D (2010) Developing a unified framework of the business model concept. Eur J Inf Syst 19(3):359–376
5. American Marketing Association (AMA) (2018) Marketing management.
https://www.ama.org/resources/Pages/Marketing-Dictionary.aspx
. Accessed 2 August 2018