Watson, Adam, author
Routledge , 1997
Buku Teks
Kalijarvi, Thorsten V., author
Thomas Y. Crowell, 1954
Buku Teks
Organski, A.F.K., author
Alfred A. Knopf, 1969
Buku Teks
Mander, Linden A.
Stanford University Press, 1948
Buku Teks
edited by Roy C. Macridis
Prentice-Hall, 1959
Buku Teks