Singla, Puneet
CRC Press, Taylor & Francis Group, 2008
Buku Teks SO
edited by Albert C.J. Luo, Jose Antonio Tenreiro Machado and Dumitru Baleanu
Springer, 2012
eBooks
Hargreaves, Martin
Longman, 1996
Buku Teks SO
Luo, Albert C.J.
Springer, 2012
eBooks
Donald E. LaCourse, editor-in-chief
McGraw-Hill, 1995
Buku Referensi