The Specific Vulnerability of Religious Minorities Religious Freedom Series Vol 6: Dennis P. Petri: The Specific Vulnerability of Religious Minorities. VKW: Bonn, 2021. 302 pp. ISBN 978-3-86269-235-4.
Grievous religious persecution Religious Freedom Series Vol 5: Werner Nicolaas Nel: Grievous religious persecution: A conceptualisation of crimes against humanity of religious persecution. VKW: Bonn, 2021. 496 pp. ISBN 978-3-86269-204-0, 34 Euro.