@book{7750, author = {Hernández Sampieri, Roberto and Fernández Collado, Carlos.}, title = {Metodología de la investigación /}, publisher = {McGraw-Hill Education,}, year = {2014.}, address = {México, D.F. :}, edition = {6a ed.}, note = {Centro de recursos en línea: http://www.mhhe.com/he/hmi6e.} }