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↑ Kot, Greg, "Rock and roll" , in the Encyclopædia Britannica , published online 17 June 2008 and also in print and in the Encyclopædia Britannica Ultimate Reference DVD; Chicago : Encyclopædia Britannica, 2010
↑ ^? ^? S. Evans, "The development of the Blues" in A. F. Moore, ed., The Cambridge companion to blues and gospel music (Cambridge: Cambridge University Press, 2002), pp. 40?42.
↑ Busnar, Gene, It's Rock ’n’ Roll: A musical history of the fabulous fifties, Julian Messner, New York, 1979, p. 45
↑ P. Hurry, M. Phillips, and M. Richards, Heinemann advanced music (Heinemann, 2001), pp. 153?4.

[kot-eb-1] Kot, Greg, "Rock and roll" , in the Encyclopædia Britannica , published online 17 June 2008 and also in print and in the Encyclopædia Britannica Ultimate Reference DVD; Chicago : Encyclopædia Britannica, 2010

[Evans2002-2] ? ^? S. Evans, "The development of the Blues" in A. F. Moore, ed., The Cambridge companion to blues and gospel music (Cambridge: Cambridge University Press, 2002), pp. 40?42.

[3] Busnar, Gene, It's Rock ’n’ Roll: A musical history of the fabulous fifties, Julian Messner, New York, 1979, p. 45

[4] P. Hurry, M. Phillips, and M. Richards, Heinemann advanced music (Heinemann, 2001), pp. 153?4.

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