1. Armstrong, J. S., & Reibstein, D. R. (1985). Evidence on the value of strategic planning in marketing; How much planning should a marketing planner plan? Strategic Marketing and Management (pp. 73–87). England; John Wiley & Sons Inc.
2. Andriopoulos, A., & Slater, S. (2013). Exploring the landscape of qualitative research in international marketing: Two decades of IMR. International Marketing Review, 30(4), 384–412.
3. Bala, M., & Verma, D. (2018). A critical review of digital marketing. International Journal of Management, IT & Engineering, 8(10), 321–339.
4. Becker, J.-M., Ringle, C. M., Sarstedt, M., & Volckner, F. (2015). How collinearity affects mixture regression results. Marketing Letters, 26(4), 643–659.
5. Bellenger, D. N., Bernhardt, K. L., & Goldstucker, J. L. (2011). Qualitative research in marketing. Marketing Classics Press.