Lenz, Millicent. His Dark Materials Illuminated: Critical Essays on Phillip Pullman's Trilogy. Wayne State University Press. 2005. ISBN 0-8143-3207-2.
Wheat, Leonard F. Philip Pullman's His Dark Materials - A Multiple Allegory: Attacking Religious Superstition in The Lion, the Witch and the Wardrobe and Paradise Lost.
Robert Darby: Intercision-Circumcision: His Dark Materials, a disturbing allegory of genital mutilation[2]