Pogge, Thomas, author
Polity Press, 2008
Buku Teks
Steiner, Henry J., author
Oxford University Press, 2000
Buku Teks
edited by Kenneth W. Thompson
University Press of America, 1980
Buku Teks
Delaet, Debra L., 1968-, author
Cengage Learning, 2015
Buku Teks
Delaet, Debra L., 1968-, author
Thomson Wadsworth, 2006
Buku Teks