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Web links
1. https://www.simplilearn.com/history-and-evolution-of-digital-marketing-article
2. https://www.simplilearn.com/history-and-evolution-of-digital-marketing-article
3. https://www.singlegrain.com/digital-marketing/best-online-marketing-companies/
4. https://www.singlegrain.com/res/digital-marketing-agency/case-studies/
5. https://www.zazzlemedia.co.uk/blog/coca-cola-digital-marketing
6. https://www.digitalseoguide.com/digital-marketing/how-to-create-a-digital-marketing-strategy/
7. http://www.mediaocean.com/digital-marketing-guide/overview-history
8. https://www.webintegrations.co.uk