@book{98192,
	author = {Bullough, William Sydney},
	title = {Vertebrate reproductive cycles.},
	publisher = {Methuen},
	year = {[1961]},
	series = {Methuen's monographs on biological subjects},
	address = {London},
	edition = {[2d ed.]},
	note = {First published in 1951 under title: Vertebrate sexual cycles.}
}