@book{Fromm1976, author = {Erich Fromm}, title = {Tener o ser?, M{\´e}xico (Fondo de Cultura Econ{\´o}mica) 20° ed., 2009.}, url = {http://www.fondodeculturaeconomica.com/librerias/libro/Tener_o_ser/007071R\%20\%20\%20\%20\%20\%20\%20\%20}, year = {1976}, }