• The Life of Mohammad (Allahabad, 1851)
• Das Leben und die Lehre des Mohammad nach bisher grösstentheils unbenutzten Quellen (Berlin, 1869)
  [Erster Band], [Zweiter Band], [Dritter Band]
  (English Translation of the Title: The Life and Teaching of Muhammad, based on so far mostly unused original sources)
• Mohammed und der Koran - Eine psychologische Studie (Hamburg, 1889)
  (English Translation of the Title: Muhammad and the Koran - A Psychological Study)

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