Botzaris, Notis
Librairie E. Droz, 1962
Buku Klasik
Riker, T.W.
Oxford University Press , 1931
Buku Teks
Stoyan, P. B.
Foreign Policy Association, 1940
Buku Teks
Boisacq, Emile, author
Heidelberg, 1950
Buku Referensi
Weale, B.L. Putnam
MacMillan , 1908
Buku Teks