Weber, Eugen, author
D.C. Heath, 1959
Buku Teks
Ploscowe, Morris, author
Hawthorn Books, 1955
Buku Teks
Baker, Edward Mayer, author
Christopher Publishing House, 1959
Buku Teks
tranlated from the Russion by H. Chizhevsky
Progress Publishers, 1977
Buku Teks
Bisset, Alison, author
Cambridge University Press, 2012
Buku Teks