edited, John B. Williamson, Linda Evans and Michael Rustad
Little, Brown, 1985
Buku Teks
Sampson, Edward G., author
John Wiley & Sons, 1976
Buku Teks
edited by Lawrence S. Wringtsman
Wadsworth, 1968
Buku Teks
Bell, Winifred, author
Macmillan, 1983
Buku Teks
edited by Peter J. Burke
Stanford University Press, 2006
Buku Teks