APA (7th ed.) Citation

Schoppert, E., Siering, B., & Thelen, T. (1988). Bonn. Parkland.

Chicago Style (17th ed.) Citation

Schoppert, Erhard, Bernd Siering, and Thomas Thelen. Bonn. Stuttgard: Parkland, 1988.

MLA (9th ed.) Citation

Schoppert, Erhard, et al. Bonn. Parkland, 1988.