Pitkänen, Pirkko
Springer, 2012
eBooks
Plender, Richard
Sijthoff, 1972
Buku Teks SO
edited by Brian Opeskin, Richard Perruchoud, Jillyanne Redpath-Cross
Cambridge University Press,, 2012
Buku Teks
Horwitz, Morton J.
Harvard University Press, 1977
Buku Teks
Vincent Chetail, Celine Bauloz
Edward Elgar, 2015
Buku Teks SO