Sansom, Katharine, 1883-, author
The Diplomatic Press , 1972
Buku Teks
Maurois, A. (Andre), author
E.P. Dutton & co., Inc., 1959
Buku Referensi
Watt, Alan
Angus and Robertson in Association with the Australian Institute of International Affairs, 1972
Buku Teks
Tarling, Nicholas, author
Oxford University Press, 1982
Buku Teks
Bocca, Geoffrey
Doubleday & Company, Inc., 1959
Buku Teks