Levitt, Theodore, author
McGraw-Hill, 1974
Buku Teks
Morris, Michael H., author
Sage, 2001
Buku Teks
Budiarto Subroto, author
ANDI, 2011
Buku Teks
Shaw, Steven J., author
Macmillan, 1966
Buku Teks
Brierty, Edward G., author
Prentice-Hall, 1998
Buku Teks