Sumber dari :http://www.cochlear.com/wps/wcm/connect/6133f05d-35eb-439c-aeb5-a9a5edc59909/product_cochlearimplaSunt_rehabilitationresources_earlyintervention_soundfoundationforbabies_weeklyhomelessons_auditionweek7_en_559kb.pdf?MOD=AJPERES&CONVERT_TO=url&CACHEID=6133f05d-35eb-439c-aeb5-a9a5edc59909
