@book{21830,
	author = {Jackson, Robert William Brierley.},
	title = {Application of the analysis of variance and covariance method to educational problems ...},
	publisher = {Dept. of Educational Research, University of Toronto},
	year = {[1940]},
	series = {[Toronto. University. Ontario College of Education] Bulletin no. 11 of the Dept. of Educational Research},
	address = {Toronto,}
}