Petrenko, Victor F., and Robert W. Whitworth. "Point defects." Physics of Ice. : Oxford University Press, 2002-01-17. Oxford Scholarship Online. 2010-01-01. Date Accessed 23 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198518945.001.0001/acprof-9780198518945-chapter-6>.
Petrenko, V., & Whitworth, R.(2002-01-17). Point defects. In Physics of Ice. : Oxford University Press. Retrieved 23 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198518945.001.0001/acprof-9780198518945-chapter-6.
Petrenko, Victor F., and Robert W. Whitworth. "Point defects." In Physics of Ice. : Oxford University Press, 2002-01-17. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198518945.001.0001/acprof-9780198518945-chapter-6.
Petrenko VF, Whitworth RW. Point defects. In: Petrenko VF, Whitworth RW. Physics of Ice. Oxford University Press; 2002. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198518945.001.0001/acprof-9780198518945-chapter-6. Accessed May 23, 2013.