@book{22, author = {Guyton, Arthur and Hall, John}, title = {Tratado de fisiología médica}, publisher = {Elsevier}, year = {2011}, address = {Barcelona}, edition = {12ª ed.}, url = {http://books.google.com.ar/books?id=UMYoE90LPmcC&lpg=PP1&hl=es&pg=PP1#v=onepage&q&f=false} }