Seery, John Evan
Westview Press , 1990
Buku Teks
Barker, Sir Ernest, author
University Paperbacks, 1960
Buku Teks
Ebenstein, William, author
Thomson Learning, 2000
Buku Teks
Bai, Gang, 1940-, author
Tianjin Renmin Chubanshe, 2002
Buku Teks
Mason, Alpheus Thomas,1899-1989, author
Prentice-Hall, 1959
Buku Teks