@book{18558,
	author = {Knowles, Malcolm Shepherd and Knowles, HUlda.},
	title = {Introduccón a la dinámica de grupo},
	publisher = {Editorial Letras},
	year = {1969.},
	address = {México},
	edition = {3. ed.},
	note = {Translation of : Introduction to group dinamics.}
}