@book{4302,
	author = { Heemskerk, W.  and Nederlof, Suzanne},
	title = {Outsourcing agricultural advisory services :},
	publisher = {Royal Tropical Institute,},
	year = {2008},
	series = {Bulletin},
	address = {Amsterdam:},
	url = {https://www.kit.nl/wp-content/uploads/2018/08/1433_Bull380-web.pdf}
}