Burke, Gill, author
Longman, 1981
Buku Teks
Peffer, R.G. (Rodney G.), 1952-, author
Princeton University Press, 1990
Buku Teks
Viano, Emilio C., author
Nelson-Hall, 1975
Buku Teks
Longrigg, Stephen Hemsley, author
Oxford University Press , 1956
Buku Teks
Al-Feel, Muhammad Rashid
The Ministry of Culture and Guidance, 1964
Buku Teks