Bentley, Eric, The Playwright As Thinker, Harcourt Brace, 1987.

This study examines the philosophical point of view in Ibsen's works.

Egan, Michael, Ibsen: The Critical Heritage, Routledge, 1972.

Egan traces the history of the critical response to Ibsen's plays.

Haugen, Einar, Ibsen's Drama, University of Minnesota Press, 1979.

Haugen engages in a comprehensive examination of the themes and structure of Ibsen's plays, including

Meyer, Michael, Ibsen: A Biography, Doubleday, 1971.

Meyer presents a thoughtful analysis of Ibsen's life, tracing "his development as a man and as a writer" and offering an assessment of his work, "both intrinsically and historically." He also discusses Ibsen's impact on the theatre.