Graber, Mark A.
Oxford University Press, 2015
Buku Teks
Cahn, Steven M.
Harper & Row, 1971
Buku Teks
Vaganay, Leon
Cambridge University Press, 1991
Buku Teks
Rafael Ball
Chandos Publishing, 2018
Buku Teks
Janet Marstine, editor
Blackwell Publishing, 2010
Buku Teks