@book{40716,
	author = {Freese, Ralph S. and McKenzie, Ralph.},
	title = {Commutator theory for congruence modular varieties},
	publisher = {Cambridge University Press},
	year = {1987.},
	series = {London Mathematical Society lecture note series},
	address = {Cambridge [Cambridgeshire]},
	note = {Includes indexes.}
}