Mackerras, Colin, author
World Scientific, 2015
Buku Teks
edited by Geoffrey A. Hosking and George F. Cushing
Macmillan Press, 1989
Buku Teks
Weber, Max, 1864-1920, author
University of California press, 1978
Buku Teks
McKay, John P., author
Houghton Mifflin , 1983
Buku Teks
Burton, Graeme, author
McGraw-Hill, 2010
Buku Teks