Barradas, Gerald
Pageant Press , 1956
Buku Teks
Dobb, Maurice, author
International Publishers, 1947
Buku Teks
Weber, Max, 1864-1920, author
Routledge Classics , 2001
Buku Teks
Pigou, A.C. (Arthur Cecil), author
Macmillan, 1958
Buku Teks
Schumpeter, Joseph A.
Harper , 1950
Buku Teks