Ray, Mary Barnard
Thomson West, 2006
Buku Teks SO
Biskind, Elliott L.
Clark Boardman, 1971
Buku Teks
Biskind, Elliott L.
Clark Boardman, 1971
Buku Teks SO
Garner, Bryan A.
The University of Chicago Press, 2001
Buku Teks SO
Haggard, Thomas R.
West Publishing, 1996
Buku Teks SO