Bogard, Travis Contour in Time The Plays of Eugene O'Neill, Oxford University Press, 1988

Cargil, Oscar, Editor O'Neill and His Plays. Four Decades of Criticism, New York University Press, 1961

Dubost, Thierry. Struggle, Defeat, or Rebirth: Eugene O'Neill's Vision of Humanity, McFarland, 1997.

Engel, Edwm A. The Haunted Heroes of Eugene O'Neill, Harvard University Press, 1953

Floyd, Virginia, Editor. Eugene O'Neill A World View, Ungar, 1979

Shaughnessy, Edward L., Down the Nights and Down the Days. Eugene O'Neill's Catholic Sensibility, University of Notre Dame Press, 1996.

Skinner, Richard Dana. Eugene O'Neill: A Poet's Quest, Longmans, 1935.

Wainscott, Ronald H Staging O'Neill- The Experimental Years, 1920-1934, Yale University Press, 1988