Singh, U.K., author
International encyclopedia of professional management Vol. 5, export management
New Delhi : Anmol Publications, 1998,
 Buku Referensi
Singh, U.K., author
International encyclopedia of professional management Vol. 7, sales management
New Delhi : Anmol Publications, 1998,
 Buku Referensi
International encyclopedia of islamic dynasties : (a continuing series) V ol. 8 Bangladesh
editor in chief, Nagendra Kr Singh
New Delhi : Anmol, 2000,
 Buku Referensi
Encyclopedia of psychology; Vol. 4
edited by Raymond J. Corsini
John Wiley & Sons, 1994
 Buku Referensi
Encyclopedia of mathematics Vol. 3
Kluwer Academic Publishers, 1995,
 Buku Referensi
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