Alexander, Harriet Semmes, 1949-, author
Swallow Press, 1986
Buku Referensi
Dobson, Frank S., author
Richmond, 1992
Buku Teks
The British Council
The British Council, 1999
Buku Teks
Fairbank, John K. (John King), author
Harvard University Press, 1950
Buku Referensi
Kepple, Robert J.
University Press of America, 1981
Buku Referensi