Uvarov, E.B.
Penguin, 1978
Buku Referensi
edited by R.N. Chopra
Anmol Publications, 1992
Buku Referensi
Reitz, Joan M.
Libraries Unlimited, 2004
Buku Referensi
editor in chief, Charles A. Ford
Encyclopedia Britannica Educational Corporation, 1969
Buku Referensi
consultant editor, D.E. Hathway
Harrap, 1985
Buku Referensi