APA (7th ed.) Citation

Houtsma, M. T. (1897). Der Islam. [publisher not identified].

Chicago Style (17th ed.) Citation

Houtsma, Martijn Theodor. Der Islam. [Erscheinungsort nicht zu ermitteln]: [publisher not identified], 1897.

MLA (8th ed.) Citation

Houtsma, Martijn Theodor. Der Islam. [publisher not identified], 1897.