Stroud, Barry. "Causation." Engagement and Metaphysical Dissatisfaction: Modality and Value. : Oxford University Press, 2011-01-14. Oxford Scholarship Online. 2011-05-01. Date Accessed 20 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199764969.001.0001/acprof-9780199764969-chapter-2>.
Stroud, B.(2011-01-14). Causation. In Engagement and Metaphysical Dissatisfaction: Modality and Value. : Oxford University Press. Retrieved 20 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199764969.001.0001/acprof-9780199764969-chapter-2.
Stroud, Barry. "Causation." In Engagement and Metaphysical Dissatisfaction: Modality and Value. : Oxford University Press, 2011-01-14. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199764969.001.0001/acprof-9780199764969-chapter-2.
Stroud B. Causation. In: Stroud B. Engagement and Metaphysical Dissatisfaction: Modality and Value. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199764969.001.0001/acprof-9780199764969-chapter-2. Accessed May 20, 2013.