Callaghan, Morly
Macmillan, 1983
Koleksi Publik
Griffith, Ernest
Frederick A. Praeger, 1954
Buku Teks
Neal, Ernest E.
Agency for International Development, 1972
Buku Teks
Scott, Ernest
Oxford University Press, 1916
Buku Teks
Guisan, Gilbert
Geneve Librairie E Droz 1962
Buku Teks