Israel, Saul
World geography today
Holt, Rinehart and Winston, 1976
 Buku Teks SO
Federico, Ronald C.
Social welfare today's world
McGraw-Hill, 1990
 Buku Teks
Talbot
South Asia In The World Today
 Buku Teks
Berger, Morroe
The Arab world today
Anchor Books, 1964
 Buku Teks SO
Stair, Ralph M., Jr.
Computers in today's world
Irwin, 1986
 Buku Teks SO