Harvie, Christopher T
0, 1994
Buku Teks
Thomson, Ian, author
John Murray, 1957, 1960
Buku Teks
Hsu, Immanuel C.Y.
Oxford University Press, 1970
Buku Teks
Todd, Lewis Paul, author
Harcourt Brace Jovannovich, 1972
Buku Teks
Tawney, R.H., author
A Mentor Book, 1926
Buku Teks