Macquitty, Miranda
Firefly Books, 1997
Buku Referensi
Cambridge University Press, 1998
Buku Teks SO
Olbers, Dirk
Springer, 2012
eBooks
Neumann, G. [Gerhard]
Elsevier, 1968
Buku Teks SO
edited by Larry W. Bowman and Ian Clark
Westview Press, 1981
Buku Teks SO