Smith, Henry
University Press , 1962
Buku Teks
Schumpeter, Joseph A.
Harper , 1950
Buku Teks
Tang Art, 2011
Buku Referensi
Lydall, Harold
Oxford University Press, 1984.
Buku Teks
Russell, Bertrand, 1872-1970, author
George Allen & Unwin Ltd, 1949
Buku Teks