edited by George M. Foster and Robert V. Kemper
Little, Brown, 1974
Buku Teks
Fisher, Michael D., author
Routledge, 1993
Buku Teks
Kuper, Adam, author
Pica Press, 1973
Buku Teks
Sievert, Thomas, author
Spon Press, 2003
Buku Teks
Harper & Brothers, 1960
Buku Teks