Written by Christopher Hampton, published by Samuel French in 1985.
Based on 1782 novel of the same name by Pierre Ambroise Francois Choderlos de Laclos.

There is an excerpt of the play printed on pp. 249-269 of The Best Plays of 1986-87, edited by Otis L. Guernsey Jr. and Jeffrey Sweet (Dodd, Mead & Co., 1988).  There is additional material about the play throughout the volume—check the index.

1.  Plays and screenplays by Christopher Hampton.

2.  Criticism/Interpretation of Christopher Hampton.

3.  Criticism/Interpretation/Biography of Choderlos de Laclos.

4.  Read by Madame de Tourvel:

Christian Thoughts, Volume Two.
Could be Christian Thoughts for Every Day of the Month (With a Prayer:  Wherein is represented the Nature of Unfeigned Repentance and of Perfect Love Towards God), written by Dominique Bouhours in 1705.

Clarissa, written in seven volumes by Samuel Richardson in 1747-1748.
Full title is Clarissa, or The History of a Young Lady:  Comprehending the Most Important Concerns of Private Life.  And Particularly Shewing, the Distresses That May Attend the Misconduct Both of Parents and Children, in Relation to Marriage.

 Pamela, or Virtue Rewarded (1740)
 Sir Charles Grandison (1753-54)

7.  18th C French aristocracy and the court of Louis XVI.

8.  For more information about the French Revolution, see the entry for Revolutionary Witness:  The Preacher.