- Sorrell’s legacy: He built a holding company giant … but will it last?AdAge.com
- WPP embarks on new journey without Sorrell at the helmReuters
- End Of An Era: How Sir Martin Sorrell Changed Madison AvenueForbes
- With Martin Sorrell’s resignation at WPP, the Mad Men era truly seems overThe Globe and Mail
- WPP Chief Executive Martin Sorrell, Contending With Probe, Decided to ResignWall Street Journal