Somerville, Ian
Cambridge Woodhead-Faulkner , 1990
Buku Teks
Folsom, Ralph Haughwout, author
West Group, 1999
Buku Teks
Nellen, Annette, author
Prentice-Hall, 1999
Buku Teks
Handowo Dipo, author
1989
UI - Skripsi (Membership)
Ackoff, Russell Lincoln, 1919-, author
Wiley-Interscience, 1970
Buku Teks