1. Aimia. (2013). The rise of the savvy shopper. The impact of the recession on customer loyalty 2013. Research Report. Available at:
http://www.aimia.com/en/industries/retail/expertise.html
2. Bakos, J. Y. (1997). Reducing buyer search costs: Implications for electronic marketplaces. Management Science, 43(12), 1676–1692.
3. Centonze, C. (2012). Nuovi strumenti per l’analisi competitiva del volantino. In De Camillis R. (ed.). Promozioni Efficaci? Il Volantino: Istruzioni per l’Uso Conference Proceedings, Parma: Università degli Studi di Parma and Nielsen (pp. 28–35), 24 February 2012
4. Colloquy, Loyalty talks, various issues 2009–2014. Available online at:
http://www.colloquy.com
5. Deloitte. (2012). Global powers of retailing 2012. Available online at:
http://www.stores.org/stores%20magazine%20january%202012/global-powers-retailing-top-250