@book{30993,
	author = {Maas, Henry S. and Kuypers, Joseph A.},
	title = {From thirty to seventy},
	publisher = {Jossey-Bass Publishers},
	year = {1974.},
	series = {Jossey-Bass behavioral science series},
	address = {San Francisco},
	edition = {1st ed.},
	note = {Half-title: From thirty to seventy: a forty-year longitudinal study of adult life styles and personality.}
}