Fontdevila, Antonio. "The unity of type: ancient homologies in the genome." The Dynamic Genome: A Darwinian Approach. : Oxford University Press, 2011-06-01. Oxford Scholarship Online. 2011-09-22. Date Accessed 24 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199541379.001.0001/acprof-9780199541379-chapter-2>.
Fontdevila, A.(2011-06-01). The unity of type: ancient homologies in the genome. In The Dynamic Genome: A Darwinian Approach. : Oxford University Press. Retrieved 24 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199541379.001.0001/acprof-9780199541379-chapter-2.
Fontdevila, Antonio. "The unity of type: ancient homologies in the genome." In The Dynamic Genome: A Darwinian Approach. : Oxford University Press, 2011-06-01. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199541379.001.0001/acprof-9780199541379-chapter-2.
Fontdevila A. The unity of type: ancient homologies in the genome. In: Fontdevila A. The Dynamic Genome: A Darwinian Approach. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199541379.001.0001/acprof-9780199541379-chapter-2. Accessed May 24, 2013.