1. Quarterly retailer e-commerce sales: 3rd quarter 2019;U.S. Census Bureau,2019
2. Mitigating spillover in online retailing via replenishment;Acimovic;Manuf Serv Oper Manag,2017
3. Retail digitalization: implications for physical stores;Hagberg;J Retail Consum Serv,2017
4. Keyes D.. E-commerce will make up 17% of all US retail sales by 2022 and one company is the main reason. Business Insider; 2017. Retrieved in December 2018 from: https://www.businessinsider.com/e-commerce-retail-sales-2022-amazon-2017-8.
5. Digital marketing: a framework, review and research agenda;Kannan;Int J Res Market,2017