I discuss personas in Strategize: Product Strategy and Product Roadmap Practices for the Digital Age. While the discussion is brief, it puts personas in the context of developing a winning strategy.
You can find more information on the persona template in the following articles:
A Template for Writing Great Personas explains how the template is applied.
10 Persona Tips for Agile Product Managements helps you write great personas when working with Lean Startup, Customer Development, and Scrum.
From Personas to User Stories discusses how the persona template helps you discover the right user stories.
Market Segmentation Tips helps you choose the right approach to divide up the market and to write focused personas.
The Product Canvas shows how the persona template can be used on the canvas, and how it relates to user stories, scenarios, storyboards, and other UX artefacts.