Singh, U.K., author
New Delhi : Anmol Publications, 1998,
Buku Referensi
edited by Muriel Albers Bittel, Lester Robert Bittel and Jackson Eugene Ramsey
Grolier International, 1995
Buku Referensi
Still, Richard R
Prentice Hall International, 1988
Buku Teks
Jones, John G., author
Alexander Hamilton Institute, 1961
Buku Teks
Hombur, Christian, 1962-, author
[Springer, ], 2012
eBooks