1. Cooper, A., 1999, The Inmates Are Running the Asylum, SAMS.
2. Pruitt, J., Adlin, T., 2006, The Persona Lifecycle: Keeping People in Mind Throughout Product Design, Morgan Kaufmann.
3. A Richardson - HBR Blog Network, posted, 2010, Using customer journey maps to improve customer experience, http://www.iimagineservicedesign.com/wp-content/uploads/2015/09/Using-Customer-Journey-Maps-to-Improve-Customer-Experience.pdf.
4. Using visualization techniques for enhancing public participation in planning and design: process, implementation, and evaluation, K Al-Kodmany - Landscape and urban planning, 1999 - Elsevier.
5. Laddering theory, method, analysis, and interpretation, TJ Reynolds, J Gutman - Journal of advertising research, 1988 - universalrg.org.