Scott, John, author
Longman, 1994
Buku Teks
Turner, Jonathan H., author
Goodyear, 1976
Buku Teks
Sen, Amartya, 1933-, author
English Language Book Society, 1981
Buku Teks
George Allen & Unwin in association with the Australian Labor Party, 1983
Buku Teks
Cohen, Daniel
MIT Press, 1988
Buku Teks