Walford, Nigel
John Wiley & Sons, 2002
Buku Teks SO
Ian Masser, Michael Blakemore,edited
Longman Scientific & Technical, 1994
Buku Referensi
Wadsworth, Richard
Longman limited , 1999
Buku Teks
Sergio Di Martino, editor
[, Springer-Verlag], 2012
eBooks
Chang, Kang-Tsung, 1943-
McGraw-Hill, 2012
Buku Teks SO