Singh, U.K.
International encyclopedia of professional management : vol. 3, Strategic management
Anmol Publications, 1998
 Buku Referensi
Singh, U.K.
International encyclopedia of professional management Vol. 4, Project management
New Delhi : Anmol Publications, 1998,
 Buku Referensi
Singh, U.K.
International encyclopedia of professional management Vol. 6, financial management
New Delhi : Anmol Publications, 1998,
 Buku Referensi
Singh, U.K.
International encyclopedia of professional management Vol. 5, export management
New Delhi : Anmol Publications, 1998,
 Buku Referensi
Singh, U.K.
International encyclopedia of professional management Vol. 7, sales management
New Delhi : Anmol Publications, 1998,
 Buku Referensi