@Book{RANFE2009002456, title = "A century of the U. S. Pharmacopeia, 1820-1920 : synonymus and abreviarions ", author = "Langenhan, H. A.", publisher = "Wisconsin : Pharmaceutical Experiment Station", editor = "Pharmaceutical Experiment Station", URL = "http://bibliotecavirtual.ranf.com/i18n/consulta/registro.do?id=2456", year = "1923", }