Armstrong, Isobel. Jane Austen, Mansfield Park. Penguin, London, 1988.
Austen, Jane. Mansfield Park. Penguin Books, Harmondsworth, England, 1970.
Copeland, Edward. The Cambridge Companion to Jane Austen. Cambridge University Press, Cambridge, 1997.
Looser, Devoney, ed. Jane Austen and Discourses of Feminism. St. Martin's Press, New York, 1995.
Monaghan, David, ed. Jane Austen in a Social Context. Barnes & Noble Books, Totowa, NJ, 1981.
Simons, Judy, ed. Mansfield Park and Persuasion. St. Martin's Press, New York, 1997. (A particularly good collection of essays.)
Steffes, Michael. "Slavery and Mansfield Park: The Historical and Biographical Context." English Language Notes 34(2): 1996.
Tanner, Tony. Jane Austen. Harvard University Press, Cambridge, MA, 1986.
Woolf, Virginia. A Room of One's Own. Harcourt Brace Jovanovich, New York, 1981.
Regarding Maria Bertram and Mrs. Norris in the last chapter, neither leaves England. When Austen writes that "an establishment [is] being formed for them in another country," she does not mean continental Europe. Here, "country" simply means another part of the same country (most likely somewhere in the countryside). They are still in England.