@book{250,
	author = {Votta, Roberto A. and Parada, Osvaldo H.},
	title = {Compendio de Obstetricia /  },
	publisher = {López Libreros editores;},
	year = {1998.},
	address = {Buenos Aires: },
	edition = {1a ed.},
	note = {Votta, R. (1998). Compendio de Obstetricia. (3a ed.). Buenos Aires : López libreros editores. }
}