Marks, John, author
Heinemann, 1983
Buku Teks
Brace, Richard M., author
Holt, Rinehart and Winston, 1961
Buku Referensi
Fitzgerald, Robert, 1959-, author
Cambridge University Press, 2015
Buku Teks
Third World Network, 1988
Buku Teks
Whitehead, Alfred North, 1861-1947, author
New American Library, 1956
Buku Teks