@book{2637,
	author = {Llewellyn-Jones Derek},
	title = {Fundamentals of Obstetrics and Gynaecology,},
	publisher = {ELBS,},
	year = {1986.},
	edition = {4th ed. vol.I},
	url = {https://www.amazon.co.uk/Fundam-Obs-Gynae-1-Obstets/dp/0571137261}
}