APA (7th ed.) Citation

Voiceprint (Firm), Palmer, T., Bienert, R., & Bauer, S. (2008). The Salzburg Festival: A brief history. Voiceprint.

Chicago Style (17th ed.) Citation

Voiceprint (Firm), Tony Palmer, Renate Bienert, and Sabine Bauer. The Salzburg Festival: A Brief History. [England]: Voiceprint, 2008.

MLA (9th ed.) Citation

Voiceprint (Firm), et al. The Salzburg Festival: A Brief History. Voiceprint, 2008.