@book{15003,
	author = {Thorpe,},
	title = {Duetting and antiphonal song in birds; its extent and significance /},
	publisher = {Brill,},
	year = {1972.},
	series = {Behaviour, Supplements ;},
	address = {Leiden ;},
	url = {http://dx.doi.org/10.1163/9789004629233}
}