In CSS 2010 and CSS 2011, passages of Precis were taken from the book; Conquest of Happiness by Bertrand Russell.
Here is the online link of the book:
Bertrand Russell's The Coquest of Happiness (Full Text) - ƒ‰ƒbƒZƒ‹‚ƒ|[ƒ^ƒ‹ƒTƒCƒg
CSS 2010 Precis passage is from Chapter 6 'Envy' and CSS 2011 Precis passage is from Chapter 1 'Causes of Unhappiness'.