2 1 50 George A. Boyne, Kenneth J. Meier, Laurence J. O’Toole Jr. and Richard M. Walker Primary Author mixed material 0521859913 New York Cambridge University Press 2006 abe2110.PNG.PNG Richard M. Walker Primary Author George A. Boyne Primary Author Gene A. BreGene A. Brewerwer Primary Author mixed material 9780521116633 United Kingdom Cambridge University Press, New York 2010 Abe30.PNG.PNG