- Bahá'í Apologetics?, by Udo Schaefer (2001). — Apologetics is a branch of systematic theology rather than religious studies. It can help explore th...
- Dialogue on Infallibility: A response to Udo Schaefer's 'Infallible Institutions?', by Peter Terry (2006). — An extended review of the themes first published in Schaefer's Making the Crooked Straight, presente...
- Infallible Institutions?, by Udo Schaefer (2002). — Historical and Baha'i interpretations of infallibility.
- Making the Crooked Straight: A Contribution to Baha'i Apologetics [excerpt], by Udo Schaefer, Nicola Towfigh, Ulrich Gollmer, Geraldine Schuckelt, trans. (2000). — Front- and back-matter of the book only: Contents, Preface, Introduction, Conclusion, Bibliography, ...
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, Ulrich Gollmer (2007). — Two pages on a prophecy concerning the advent of Man Yuzhiruhu'llah.
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, and Ulrich Gollmer: Review, by Seena Fazel (2004-01-20).
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, and Ulrich Gollmer: Review, by Heshmat Moayyad (1998). — A commentary for Baha’is examining the balance of critical thought with loyalty to Baha’i instit...
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, and Ulrich Gollmer: Review, by Seena Fazel (2004).
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, and Ulrich Gollmer: Review, by Manfred Hutter (1997-10).
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, and Ulrich Gollmer: Review, by Christian Cannuyer (1997).
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, and Ulrich Gollmer: Review, by Christian Cannuyer (1997).
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, and Ulrich Gollmer: Review, by Iain S. Palin (2000 November).
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, and Ulrich Gollmer: Review, by Denis MacEoin (2001-06).
- Making the Crooked Straight, by Udo Schaefer, Nicola Towfigh, and Ulrich Gollmer: Review, by Christian Cannuyer, Greg Massiah, trans. (1998).
- Making the Crooked Straight, review by Denis MacEoin: Responses, by Anthony Lee, Kavian Sadeghzade Milani, Udo Schaefer (2001). — Responses by Tony Lee, Kavian Milani, and Udo Schaefer to Denis MacEoin's review of Making the Crook...
- Making the Crooked Straight: Foreword, and letter to World Order, by Jack McLean (2000/2005). — Foreword to the published book, followed by a letter to the editor for World Order regarding their i...
- Refutation of Francesco Ficicchia and the Dangers of Silence, The, by Jack McLean (2001). — Examination of the prejudice caused to the reputation of the Faith in academic and ecclesiastical ci...
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