Erikson, Erik H., author
Norton & Company , 1969
Buku Teks
Thomas Hegghammer, editor
Cambridge University Press, 2017
Buku Teks
Bisson, T.A., author
The Foreign Policy Association , 1941
Buku Teks
Hegghammer, Thomas, author
Cambridge University Press, 2017
eBooks
Vernadsky, George
At The Clarendon Press, 1959
Buku Teks