Schweitzer, Albert, author
Henry Holt, 1958
Buku Teks
Ziegler, David M., author
Little, Brown, 1981
Buku Teks
Barton, John H.
Stanford University Press, 1981
Buku Teks
Tim Dunne
Oxford University Press, 2010
Buku Teks
Edited by Tim Dunne, Milja Kurki, Steve Smith
Oxford University Press, 2016
Buku Teks