"AGT Winner Grace VanderWaal Sings For Natalie & Kit!", World Airline's YouTube channel, video at 4:16–4:23, September 28, 2016, accessed December 10, 2016; and Roberts, Karen.
"AGT Winner Grace VanderWaal Sings For Natalie & Kit!", kanal YouTube World Airline, video pada 4:16–4:23, September 28, 2016, diakses pada 10 Desember 2016; dan Roberts, Karen.