Checkland, Peter
John Wiley & Sons, 2009
Buku Teks
edited by J.M. Gvishiani
Pergamon Press, 1984
Buku Teks
edited by M. G. Singh, A. Titli, and Laboratoire d'automatique et d'analyse des systemes du C.N.R.S
Pergamon Press, 1978
Buku Referensi
Winardi
Karya Nusantara, 1980
Buku Teks
Voland, Gerard
Prentice-Hall, 1986
Buku Teks