"2+2=5," Symbol of Tyranny or Freedom in the Technological Society: a Study of the Number Symbol in Orwell's Nineteen Eighty-Four and Dostoevsky's Notes From the Underground

Campbell, James Oscar , Great English Poets New York: F.S. Crofts & Co., 1929, p. 825.

Dostoevsky, Fyodor , Notes from Underground. Robert G. Durgy, ed. Serge Shishkoff, transl. New York: Thomas Y. Crowell Company, Inc., 1969.

Orwell, George , Nineteen Eighty-Four New York: Harcourt, Brace Jovanovich, Inc., 1949.