Velupillai, Kumaraswamy. "Explorations in Computable Economics." Computable Economics: The Arne Ryde Memorial Lectures. : Oxford University Press, 2000-01-06. Oxford Scholarship Online. 2003-11-01. Date Accessed 21 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/0198295278.001.0001/acprof-9780198295273-chapter-9>.
Velupillai, K.(2000-01-06). Explorations in Computable Economics. In Computable Economics: The Arne Ryde Memorial Lectures. : Oxford University Press. Retrieved 21 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/0198295278.001.0001/acprof-9780198295273-chapter-9.
Velupillai, Kumaraswamy. "Explorations in Computable Economics." In Computable Economics: The Arne Ryde Memorial Lectures. : Oxford University Press, 2000-01-06. http://www.oxfordscholarship.com/view/10.1093/0198295278.001.0001/acprof-9780198295273-chapter-9.
Velupillai K. Explorations in Computable Economics. In: Velupillai K. Computable Economics: The Arne Ryde Memorial Lectures. Oxford University Press; 2000. http://www.oxfordscholarship.com/view/10.1093/0198295278.001.0001/acprof-9780198295273-chapter-9. Accessed May 21, 2013.