Stoff, Sheldon Ptaschevitch, author
Harper & Row , 1969
Buku Teks
by Daniel S. Cheever ... [et al.]
Addison-Wesley, 1986
Buku Teks
Noor, Abdun, author
World Bank, 1981
Buku Teks
Richie, Donald, author
Charles E. Tuttle, 1995
Buku Teks
by Ilene F. Rockman ... [and others]
Jossey-Bass, 2004
Buku Teks