Kalijarvi, Thorsten V.
Thomas Y. Crowell, 1954
Buku Teks
Organski, A.F.K.
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
edited by Roy C. Macridis
Prentice-Hall, 1967
Buku Teks