@book{50190,
	author = {Palloff, Rena M. and Pratt, Keith},
	title = {Building learning communities in cyberspace},
	publisher = {Jossey-Bass},
	year = {1999},
	series = {The Jossey-Bass higher and adult education series},
	address = {San Francisco, Calif.},
	edition = {1. Aufl.}
}