Jessup, Ronald
Macdonald, 1968
Buku Teks SO
Christian Baumgartner , Martin Uitz, Karl Krainer, Peter Hasslacher
The Federal Press Service, 2002
Buku Referensi
Buku Teks
Deshpande, Dhananjay
English Edition, 2005
Buku Teks SO
edited by Don Rubin, Peter Nagy and Philippe Rouyer
Routledge, 2001
Buku Referensi