Lewis, David
Cambridge University Press, 2011
Buku Teks
Sutter, John O.
Cornell University , 1959
Buku Teks
Stockwin, J.A.A.
W.W. Norton, 1982
Buku Teks
Stockwin, J.A.A.
Weidenfeld and Nicolson, 1975
Buku Teks
Sharkansky, Ira
McGraw-Hill, 1975
Buku Teks