Bahá'í Faith, The: Sect or Religion?. Udo Schaefer, Gerald C. Keil, trans. (1988). Lengthy study defining the distinguishing features of the Bahá'í Faith as contrasted with other contemporary religious movements. Articles.
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 Articles-unpublished.