Stump, Gregory, author
Cambridge University Press, 2013
Buku Teks
Spencer, Andrew, author
Blackwell , 1993
Buku Teks
edited by Ricardo Aroca
Springer, 2012
eBooks
Roebuck, Julian B., author
Charles C. Thomas, 1967
Buku Teks
Olson, Everett C., author
University of Chicago Press, 1999
Buku Teks