Goshal, Kumar
Sheridan House Publisher, 1948
Buku Teks
Walker, E. A.
The University Press, 1945
Buku Teks
Wareing, John
Oxford University Press, 2017
eBooks
Maunier, Rene
Routledge & Kegan Paul Limited, 1949
Buku Teks
Syed Hussein Alatas
Frank Cass, 1977
Buku Teks