edited by R.N. Chopra
Anmol Publications, 1992
Buku Referensi
Porteous, Andrew, author
John Wiley & Sons, 1992
Buku Referensi
edited by W.F. Bynum, E.J. Browne, Roy Porter
Macmillan Reference Books, 1989
Buku Referensi
Somani, L.L., author
Agrotech Publishing Academy, 1992
Buku Referensi
Reitz, Joan M., author
Libraries Unlimited, 2004
Buku Referensi