Vitale, Ksenija, editor
Springer, 2012
eBooks
Georgiev, Plamen K.
Springer-VS, 2012
eBooks
edited by R.R. Betts
Royal Institute of International Affairs, 1950
Buku Teks
SEAMEO-TROMPED, 2002
Buku Referensi
edited by Harold Brookfield and Yuonne Byron
United Nations University Press, 1993
Buku Teks