@book{4223,
	author = {Ryan, Terence M.},
	title = {Theory of portfolio selection /},
	publisher = {Macmillan,},
	year = {c1978.},
	series = {Studies in finance and accounting},
	address = {London :},
	url = {http://www.worldcat.org/title/theory-of-portfolio-selection/oclc/4703396&referer=brief_results}
}