edited by Edward Dumbauld
Liberal Arts Press, 1955
Buku Teks
Altman, Matthew C
John Wiley & Sons, 2014
Buku Teks
Rachels, James, 1941-2003
McGraw-Hill , 2012
Buku Teks
Rachels, James, 1941-2003
McGraw-Hill, 1998
Buku Teks
Donaldson, Thomas
McGraw-Hill, 1986
Buku Teks