Encyclopedia of government and politics; Volume 1
edited by Mary Hawkesworth and Maurice Kogan
Routledge, 1992
 Buku Referensi
International encyclopedia of government and politics; Volume 2
edited by Frank N. Magill
Toppan, 1996
 Buku Referensi
Encyclopedia of government and politics; Volume 2
edited by Mary Hawkesworth and Maurice Kogan
Routledge, 1992
 Buku Referensi
International encyclopedia of linguistics; Volume 1
William Bright, editor-in-chief
Oxford University Press, 1992
 Buku Referensi
International military and defense encyclopedia; Volume 1
editor-in-chief, Trevor N. Dupuy, Franklin D. Margiotta, James B. Montley, David L. Bongard
Brassey's, 1993
 Buku Referensi