Jutikkala, Eino
Frederick A. Praeger, 1962
Buku Teks
Mead, W.R., author
Hurst, 1993
Buku Teks
Jakobson, Max
Center for Strategic , 1998
Buku Teks
Mus, Paul, 1902-1969
Sterling Publishers, 1998
Buku Teks
Alexandrova, Vera
New York Doubleday 1963
Buku Teks