Hussey, D. E.
Pergamon Press, 1973
Buku Teks
Hussey, D. E.
Pergamon Press , 1971
Buku Teks
Pergamon Press, 1983
Buku Teks
Ackoff, Russell Lincoln, 1919-, author
Wiley-Interscience, 1970
Buku Teks
Ackoff, Russell Lincoln, 1919-, author
John Wiley & Sons, 1981
Buku Teks