@book{351679,
	author = {Burkhauser, Susan;Pierson, Ashley;Gates, Susan M.;Hamilton, Laura S.},
	title = {Addressing Challenges in Evaluating School Principal Improvement Efforts},
	publisher = {RAND Corporation},
	year = {2012},
	url = {http://www.jstor.org/stable/10.7249/j.ctt1q60md}
}