Julien 2008c, p. 156: the beginning of the studio years; Lewisohn 1992, p. 233: no deadline. Julien, Oliver (2008c). «'A lucky man who made the grade': Sgt. Pepper and the rise of a phonographic tradition in twentieth-century popular music». In: Julien, Olivier. Sgt. Pepper and the Beatles: It Was Forty Years Ago Today. [S.l.]: Ashgate. ISBN978-0-7546-6708-7 Lewisohn, Mark (1992). The Complete Beatles Chronicle:The Definitive Day-By-Day Guide To The Beatles' Entire Career 2010 ed. [S.l.]: Chicago Review Press. ISBN978-1-56976-534-0
Davies 2009, p. 262: the recording of Please Please Me cost £400; Lewisohn 1992, p. 253: they spent 700 hours recording Sgt. Pepper. Davies, Hunter (2009) [1968]. The Beatles Revis and updat ed. [S.l.]: W.W. Norton. ISBN978-0-393-33874-4 Lewisohn, Mark (1992). The Complete Beatles Chronicle:The Definitive Day-By-Day Guide To The Beatles' Entire Career 2010 ed. [S.l.]: Chicago Review Press. ISBN978-1-56976-534-0
Lewisohn 1992, p. 236: the first time lyrics were printed in full on a rock album; Inglis 2008, p. 96: the lyrics were printed on the back cover. Lewisohn, Mark (1992). The Complete Beatles Chronicle:The Definitive Day-By-Day Guide To The Beatles' Entire Career 2010 ed. [S.l.]: Chicago Review Press. ISBN978-1-56976-534-0 Inglis, Ian (2008). «Cover story: magic, myth, and music». In: Julien, Olivier. Sgt. Pepper and the Beatles: It Was Forty Years Ago Today. [S.l.]: Ashgate. ISBN978-0-7546-6708-7
Moore 1997, p. 59: (fonte secundária); Poirier, Richard (1992). The Performing Self: Compositions and Decompositions in the Languages of Contemporary Life. [S.l.]: Rutgers University Press. p. 137: (fonte primária). Moore, Allan F. (1997). The Beatles: Sgt. Pepper's Lonely Hearts Club Band. [S.l.]: Cambridge University Press. ISBN978-0-521-57484-6
Moore 1997, pp. 18, 70–79; Moore 2002, pp. 64: the origins of progressive rock are "marked by the release of the Beatles' Sgt. Pepper's Lonely Hearts Club Band in 1967"; Moore 2002, pp. 69: "The beginnings of progressive rock are normally traced to the Beatles' Sgt. Pepper's Lonely Hearts Club Band". Moore, Allan F. (1997). The Beatles: Sgt. Pepper's Lonely Hearts Club Band. [S.l.]: Cambridge University Press. ISBN978-0-521-57484-6 Moore, Alan F. (2002). Rock: The Primary Text: Developing a Musicology of Rock 2nd ed. [S.l.]: Ashgate. ISBN978-0-7546-0298-9 Moore, Alan F. (2002). Rock: The Primary Text: Developing a Musicology of Rock 2nd ed. [S.l.]: Ashgate. ISBN978-0-7546-0298-9