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