Kynghee University Press, 1975
Buku Teks
Sawhill, John C.
Harper's Magazine, 1979
Buku Teks
Muhammad Kamil Tadjudin
UI-Press, 1998
Buku Teks
Driver, Christopher
Hodder and Stoughton , 1971
Buku Teks
by Ronald Barnett
Open University Press, 2005
Buku Teks SO