Bibliografia

https://www.google.com.mx/search?hl=es-419&site=imghp&tbm=isch&source=hp&biw=1024&bih=499&q=modelo+ecologico+de+bronfenbrenner&oq=modelo+ecologico+de+&gs_l=img.3.0.0l4j0i24l6.8642.11251.0.12285.20.16.0.0.0.0.578.3152.6j6j0j1j1j2.16.0.crnk_timepromotiona...0...1.1.32.img..8.12.1418.GIOeb1za2ag#hl=es-419&q=urie%20bronfenbrenner&tbm=isch&imgdii=_