Byrd, Jack, author
McGraw-Hill, 1982
Buku Teks
Eden, Colin, author
Macmillan, 1975
Buku Teks
Zgurovsky, Michael Z., author
Springer Cham, 2019
eBooks
by Rob Ranyard [and others]; edited by Rob Ranyard, W. Ray Crozier and Ola Svenson
Routledge , 1997
Buku Teks
Saaty, Thomas L., author
Springer, 2012
Buku Teks SO