Kohler, Ulrich
Stata Press, 2009
Buku Teks
Spencer, Donald D.
Charles E. Merrill, 1982
Buku Teks
Cashman, Thomas J.
Anaheim Publishing, 1970
Buku Teks
Bassett, Glenn A.
American Management Association, Inc., 1971
Buku Teks
Fried, Louis
Reston Publishing, 1979
Buku Teks