- Udo Schaefer. Geraldine Schuckelt, trans. Beyond the Clash of Religions: The Emergence of a New Paradigm (1998). Religious pluralism and associated issues: diversity and unity of religions, absoluteness, relativity of truth, New Age thought, and interfaith dialogue Books.
- Udo Schaefer, Nicola Towfigh, Ulrich Gollmer. Geraldine Schuckelt, trans. Making the Crooked Straight: A Contribution to Baha'i Apologetics [excerpt] (2000). Front- and back-matter of the book only: Contents, Preface, Introduction, Conclusion, Bibliography, Index. Books.
- Udo Schaefer. Geraldine Schuckelt, trans. Religious Intolerance as a Source of Violence (1994). A Bahá'í-inspired examination of how religious fanaticism and prejudice promotes violence. Articles.
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