Ferguson, Robert, Henrik Ibsen, Richard Cohen Books Ltd., 1996.

This is a more recent biography of Ibsen.

Henrik Ibsen, edited by Harold Bloom, Chelsea House Publishers, 1998.

A collection of critical essays on Ibsen's most important works.

Ibsen, Henrik, The Wild Duck, translated by Dounia B. Christiani, W. W. Norton & Company, 1968.

This edition of The Wild Duck is annotated with contemporary reviews, scholarly criticism, Ibsen's letters, and suggested sources for the play.

Shafer, Yvonne, Henrik Ibsen: Life, Work, and Criticism, York Press, 1985.

This is a popular, accessible discussion of the influences on Ibsen's work and the scholarly assessment of it.