Robertson, Lindsay G. "Harper." Conquest by Law: How the Discovery of America Dispossessed Indigenous Peoples of Their Lands. : Oxford University Press, 2005-09-22. Oxford Scholarship Online. 2007-09-01. Date Accessed 19 Jun. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195148695.001.0001/acprof-9780195148695-chapter-2>.
Robertson, L.(2005-09-22). Harper. In Conquest by Law: How the Discovery of America Dispossessed Indigenous Peoples of Their Lands. : Oxford University Press. Retrieved 19 Jun. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195148695.001.0001/acprof-9780195148695-chapter-2.
Robertson, Lindsay G. "Harper." In Conquest by Law: How the Discovery of America Dispossessed Indigenous Peoples of Their Lands. : Oxford University Press, 2005-09-22. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195148695.001.0001/acprof-9780195148695-chapter-2.
Robertson LG. Harper. In: Robertson LG. Conquest by Law: How the Discovery of America Dispossessed Indigenous Peoples of Their Lands. Oxford University Press; 2005. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195148695.001.0001/acprof-9780195148695-chapter-2. Accessed June 19, 2013.