Chapter two of Dr. Peter Bloom's dissertation as newly published in the March 2015 issue of the Journal of Raptor Research! Northward Summer Migration of Red-Tailed Hawks Fledged from Southern Latitudes.
Link to the Journal of Raptor Research.
Chapter one of Dr. Bloom's dissertation published in 2011, Vagrant Western Red-shouldered Hawks: Origins, Natal Dispersal Patterns, and Survival. The Condor 113: 538-546