edited by David E. Long and Bernard Reich
Westview Press, 1986
Buku Teks
edited by David E. Long and Bernard Reich
Westview Press, 2002
Buku Teks
Harari, Maurice, author
Prentice-Hall, 1962
Buku Teks
Milton-Edwards, Beverly, author
Routledge, 2003
Buku Teks
Moore, Clement Henry
Little, Brown & Co., 1970
Buku Teks