APA (7th ed.) Citation

Woxbrandt, B., Kunze, C., & Rowden, L. Test your english. Beaver Books.

Chicago Style (17th ed.) Citation

Woxbrandt, Barbo, Claus Kunze, and Lorna Rowden. Test Your English. Frankfurt am Main: Beaver Books.

MLA (9th ed.) Citation

Woxbrandt, Barbo, et al. Test Your English. Beaver Books.