Bahá'í Faith, The: Sect or Religion?. Udo Schaefer, Gerald C. Keil, trans. (1982 / 1988). Lengthy study defining the distinguishing features of the Bahá'í Faith as contrasted with other contemporary religious movements. Introductory.
Legacy of Verse 42 of the Kitáb-i-Aqdas, The. Gerald C. Keil (2021). Explores the circumstances under which a reading of Verse 42 which indicates that the line of Aghsan might end prior to the establishment of the Universal House of Justice came to predominate. Includes a memorandum from the Research Department. Articles-unpublished.