@book{2196,
	author = {World Health Organization},
	title = {Barrier contraceptives and spermicides : },
	publisher = {WHO, },
	year = {1987.},
	address = {Geneva :},
	url = {https://apps.who.int/iris/bitstream/handle/10665/39098/9241561017.pdf?sequence=1&isAllowed=y}
}