Chris Tollefsen has co-edited a volume of essays by the late philosopher Joseph Boyle. It is titled Natural Law Ethics in Theory and Practice: A Joseph Boyle Reader.

With John Liptay, Chris Tollefsen has published an edited collection of essays by the late philosopher Joseph Boyle.  Boyle, who died in 2016, was, with Germain Grisez and John Finnis, an architect of the New Classical Natural Law Theory.  The collection includes work on the foundations of ethical theory, the defense of free choice, action and intention, and a number of practical moral issues.  It is available at Amazon.