1. Aaker D., Kumar V., Day G. (2004). Marketing research. Saint Petersburg: Piter. (in Russ.)
2. Akhmedov M.M. (2016). Scientific and theoretical issues of investing in real estate. Ekonomika i biznes: teoriya i praktika / Economy and Business: Theory and Practice, no. 1, pp. 15–19. (in Russ.)
3. Gimarov V.V. (2012). The study of behavioural models of innovative services consumers in the telecommunications market. Transportnoe delo Rossii / Transport Business of Russia, no. 5, pp. 56–64. (in Russ.)
4. Kaldina M. (2007). Enneagram for HR. Human Resources. Monthly Supplement, no. 7, pp. 150–176. (in Russ.)
5. Kolocheva V.V., Titova N.A. (2017). Developing a new product positioning strategy. Prakticheskiy marketing / Practical Marketing, no. 4, pp. 25–31. (in Russ.)