@book{2021,
	author = {Gittinger, J. Price.},
	title = {Economic analysis of agricultural projects /},
	publisher = {Johns Hopkins University Press,},
	year = {c1982.},
	series = {EDI series in economic development,},
	address = {Baltimore , London :},
	edition = {2nd ed., completely rev. and expanded.},
	note = {Includes index.}
}