Liebknecht, Karl, author
IRE Press, 2004
Buku Teks
Toynbee, Arnold J., author
Oxford University Press, 1951
Buku Teks
Vagts, Alfred, author
Greenwood Press, 1959
Buku Teks
edited by Graeme Cheeseman, St. John Kettle
Pluto Press Australia, 1990
Buku Teks
Axelbank, Albert
Hill and Wang, 1972
Buku Teks