Com, Gerhard, author
Oxford University Press, 1955
Buku Teks
edited by Harold M. Groves
Henry Holt Company , 1950
Buku Teks
edited by Harold M. Groves
Henry Holt and Company , 1947
Buku Teks
Tompkins, Jonathan R., author
Wadsworth, 2005
Buku Teks
Smith, Kevin, author
Westview Press, Boston, Massachusetts : Credo Reference, 2013
Buku Teks