edited by Carl J. Friedrich
The Modern Library, 1949
Buku Teks
edited by Edward Dumbauld
Liberal Arts Press, 1955
Buku Teks
Altman, Matthew C, author
John Wiley & Sons, 2014
Buku Teks
Rachels, James, 1941-2003, author
McGraw-Hill , 2012
Buku Teks
Rachels, James, 1941-2003, author
McGraw-Hill, 1998
Buku Teks