Everett 1999, 123쪽. "In the United Kingdom Sgt. Pepper's Lonely Hearts Club Band...was rush-released six days ahead of its official date, June 1." harv error: 대상 없음: CITEREFEverett1999 (help)
Haugen 2004, 169쪽. harv error: 대상 없음: CITEREFHaugen2004 (help)
Riley 2011, 354쪽. harv error: 대상 없음: CITEREFRiley2011 (help)
