Models of Opportunity: How Entrepreneurs Design Firms to Achieve the Unexpected20121Gerard George and Adam J. Bock. Models of Opportunity: How Entrepreneurs Design Firms to Achieve the Unexpected . New York, Usa: Cambridge University Press 2012. 308 Pp., Isbn: 978‐0‐521.76507‐7 Hardback. 978‐0‐521.17084‐0 Paperback