http://store.mountaingoatsoftware.com/products/planning-poker-cards

http://en.wikipedia.org/wiki/Law_of_large_numbers

Деревянная игрушка; см. http://en.wikipedia.org/wiki/Jacob%27s_ladder_%28toy%29. – Примеч. перев.

Robert C. Martin, Agile Software Development: Principles, Patterns, and Practices, Up per Saddle River, NJ: Prentice Hall, 2003, pp. 20–22; Mike Cohn, Agile Estimating and Planning, Upper Saddle River, NJ: Prentice Hall, 2006.