Guardiano, Cristina. "Parametric changes in the history of the Greek article." Grammatical Change: Origins, Nature, Outcomes. : Oxford University Press, 2011-11-24. Oxford Scholarship Online. 2012-01-19. Date Accessed 23 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199582624.001.0001/acprof-9780199582624-chapter-9>.
Guardiano, C.(2011-11-24). Parametric changes in the history of the Greek article. In Grammatical Change: Origins, Nature, Outcomes. : Oxford University Press. Retrieved 23 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199582624.001.0001/acprof-9780199582624-chapter-9.
Guardiano, Cristina. "Parametric changes in the history of the Greek article." In Grammatical Change: Origins, Nature, Outcomes. : Oxford University Press, 2011-11-24. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199582624.001.0001/acprof-9780199582624-chapter-9.
Guardiano C. Parametric changes in the history of the Greek article. In: Jonas D, Whitman J, Garrett A. Grammatical Change: Origins, Nature, Outcomes. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199582624.001.0001/acprof-9780199582624-chapter-9. Accessed May 23, 2013.