@book{20713,
	author = {Mullins, David  and Mullins, Mary },
	title = {This year, next year, sometime ...?},
	publisher = {Inter-Varsity Fellowship, },
	year = {c1960, 1965},
	address = {London : },
	edition = {1 ed.},
	note = {Estudio del noviazgo y matrimonio}
}