9Aral, A. Bruce 1997, "The Road Not Taken: The Transition from Unemployment to Self-employment in Canada, 1961-1994." Canadian Journal of Sociology 22.
10Blundell, Richard, Lorraine Dearden & Barbara Sianesi 2005, "Evaluating the Effect of Education on Earnings: Models, Methods and Results from the National Child Development Survey." Journal of the Royal Statistlcal Society: Series A ( Statistics in Society) 168.
