Cita APA (7th ed.)

Houben, H. H., & Houben, H. H. (1992). [Verbotene Literatur., 2]. Olms.

Cita Chicago (17th ed.)

Houben, Heinrich Hubert, i Heinrich Hubert Houben. [Verbotene Literatur., 2]. Hildesheim: Olms, 1992.

Cita MLA (8th ed.)

Houben, Heinrich Hubert, i Heinrich Hubert Houben. [Verbotene Literatur., 2]. Olms, 1992.