@book{40523,
	author = {Dikken, G. den and Meulen, S. J. van der and Agromisa Foundation},
	title = {Duck keeping in the tropics},
	publisher = {CTA},
	year = {1999},
	series = {AGRODOK},
	address = {Wageningen, Netherlands},
	note = {Agrodok-series No. 33}
}