@book{2067,
	author = {Williamson, H. F. and Beyer, S. R.  and Beyer, S. R. ; jt. ed.},
	title = {Graduate study in economics; a guide to graduate programs in economics and agricultural economics at United States and Canadian Universities},
	publisher = {Irwin},
	year = {1969},
	address = {Illinois},
	edition = {2nd.}
}