Raymond A. Levy, editor
[, Springer], 2012
eBooks
Jacobs, Michael
Open University Press, 2006
Buku Teks SO
Kaplan, Harold I.
Williams & Wilklins , 1993
Buku Teks SO
Levine, Baruch
Prentince Hall, 1979
Buku Teks SO
Bateman, Anthony
Brunner-Routledge, 2003
Buku Teks SO