Severino, Rodolfo C., Jr., author
ASEAN Secretariat, 2002
Buku Teks
Gorman, Michael, author
Libraries Unlimited, 1990
Buku Teks
Vance, Charles C., author
McGraw-Hill, 1974
Buku Teks
Nasution, Abdul Haris, 1918-2000, author
Seruling Masa, 1971
Buku Teks
Ahuja, B. N., author
Surjeet Publications, 1989
Buku Teks