0, 0
Buku Teks
Robinson, Robert T.
Richard D. Irwin Inc., 1969
Buku Teks
Downs, Anthony
Little, Brown and Co., 1967
Buku Teks
Ristiyanti Prasetijo, author
Andi, 2005
Buku Teks
Osgood, Robert Endicott, author
University of Chicago Press, 1962
Buku Teks