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References

1. “Internet Archive Wayback Machine”. Archived from the original on 2019-06-19. Retrieved 2021-01-17

2. “Internet Archive Wayback Machine”. Archived from the original on 2021-01-07. Retrieved 2021-01-17

3. Caroline Forsey, published 2020-10-19, “The Ultimate Guide to SEM (Search Engine Marketing)”. Retrieved 2021-01-17

4. “Internet Archive Wayback Machine”. Archived from the original on 2021-01-12. Retrieved 2021-01-17

5. Nils Herrmann, published 2018-10-18, “The Digital Analytics Guide” .Retrieved 2021-01-17

6. “Internet Archive Wayback Machine”. Archived from the original on 2020-10-26. Retrieved 2021-01-17