@book{116478,
	author = {Zulliger, Hans},
	title = {Los niños difíciles},
	publisher = {Ediciones Morata},
	year = {1979.},
	series = {Colección Psicología},
	address = {Madrid},
	edition = {3. ed.},
	note = {Translation of : Schwierege Kinder.}
}