Spencer, Andrew
Blackwell , 1993
Buku Teks
edited by Ricardo Aroca
Springer, 2012
eBooks
Roebuck, Julian B.
Charles C. Thomas, 1967
Buku Teks
Olson, Everett C.
University of Chicago Press, 1999
Buku Teks
Bauer, Laurie
Cambridge University Press, 2001
eBooks