Gilani, Ijaz Shafi
Gallup Pakistan, 1985
Buku Teks
Asher, Herbert B., author
The Dorsey Press, 1980
Buku Teks
Asher, Herbert B., author
The Dorsey Press, 1984
Buku Teks
Stephens, Ian, author
Ernest Benn, 1963
Buku Teks
Bone, Hough Alvin, author
McGraw-Hill, 1981
Buku Teks