Concerning critical analysis of Huxley's Brave New World, numerous sources are at your finger tips on enotes. I've copied and will paste below just one of many cites you can go to for the information you need.
Baugh, Albert C., ed. A Literary History of England, 2nd ed. New Jersey: Prentice-Hall, 1948.
Boyce, Charles. Shakespeare A to Z. New York: Roundtable Press, 1990.
Cross, Arthur Lyon, Ph.D. A Shorter History of England and Greater Britain. New York: The MacMillan Company, 1955.
Engle, T. L., and Snellgrove, Louis. Psychology: Its Principles and Applications, 9th ed. Orlando: Harcourt Brace Jovanovich, 1989.
Harrison, G. B., ed. Shakespeare: The Complete Works. New York: Harcourt, Brace and Company, 1952.
Hoffman, Frederick J. “Aldous Huxley and the Novel of Ideas.” In Aldous Huxley: A Collection of Critical Essays, edited by Robert E. Kuehn. Prentice Hall, 1974, pp. 8-17.
Huxley, Aldous. Brave New World. New York: Harper & Row, 1946.
———. Brave New World Revisited. New York: Harper & Row, 1989.
Hynes, Samuel. The Auden Generation: Literature and Politics in England in the 1930’s. New Jersey: Princeton University Press, 1976.
Keith, M. May. Aldous Huxley. Harper & Row, 1972.
Locher, Frances Carol, ed. Contemporary Authors, Volumes 85-88. Michigan: Gale Research Company, 1980.
Macrone, Michael. Brush Up Your Shakespeare! New York: Harper Collins, 1992.
Meckier, Jerome. Aldous Huxley: Satire and Structure. Chatto & Windus, 1969.
Nance, Guinevera A. Aldous Huxley. Continuum, 1988.
Sexton, James. “Brave New World and the Rationalization of Industry.” In Critical Essays on Aldous Huxley, edited by Jerome Meckier. G.K. Hall, 1996, pp. 88-102.
Smith, Grover, ed. Letters of Aldous Huxley. Chatto & Windus, 1969.
Temple, Ruth Z., and Martin Tucker, eds. Library of Literary Criticism: Modern British Literature,Vol. II: H to P. New York: Frederick Ungar, 1966.
Thody, Philip. Huxley: A Biographical Introduction. Scribner’s, 1973.
Woodcock, George. Dawn and the Darkest Hour: A Study of Aldous Huxley. Faber & Faber, 1972.
The above is just a small fraction of what you can find here to use as outside sources. Also, the criticism itself is worth your reading. Whether you need themes or style or historical context, what you need is at your disposal.
I'll list two links for you below, and from them you can get to wherever you need to go.