Levy, Robert
Chapman and Hall, 1995
Buku Teks
Bellman, Richard
Academic Press, 1973
Buku Teks SO
edited by Panos M. Pardalos, Pando G. Georgiev, Hari M. Srivastava
Springer, 2012
eBooks
Distefano, Nestor
Academic Press, 1974
Buku Teks SO
Nayfeh, Ali Hasan
John Wiley & Sons, 1979
Buku Teks SO