- Consider some of O'Neill's other plays and writings. A full list of his other works can be found on the Eugene O'Neill electronic archive's catalogue of his works.
- Read and/or watch a few of the theatrical productions or film, television, and radio interpretations of Long Day's Journey Into Night or O'Neill's other works, a database for which can be found here.
- Examine primary source materials available by and about Eugene O'Neill, including manuscripts, letters, and photographs; an extensive listing of these resources can be found here.
- Explore excerpts of the works by other authors referred to by characters over the course of the play: Nietzsche, Kipling, Baudelaire,...
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