Cambridge University Press, 1991
eBooks
Levenson, Michael, author
Cambridge University Press, 2009
eBooks
Levenson, Joseph R.
University of California Press, 1965
Buku Teks
edited by Lawrence Cahoone
Blackwell Publishing, 2003
Buku Teks
Morrison, Wayne, author
Cavendish Publishing Limited, 2000
Buku Teks