@book{31053,
	author = {Lockhart, J. A. R. and Wiseman, A. J. L.},
	title = {Introduction to crop husbandry},
	publisher = {Pergamon Press,},
	year = {1978},
	series = {Pergamon international library of science, technology, engineering and social studies},
	address = {Oxford :},
	edition = {4 ed.}
}