"Billboard Top 20: Pop singles". Elvis Presley: Official Site of the King of Rock 'n' Roll. Elvis Presley Enterprises, Inc. 2013. Archived from the original on July 19, 2013. Retrieved May 6, 2013.
"Billboard Top 20: Pop singles". Elvis Presley: Official Site of the King of Rock 'n' Roll. Elvis Presley Enterprises, Inc. 2013. Archived from the original on July 19, 2013. Retrieved May 6, 2013.