Cita APA (7th ed.)

Schippmann, A., & Schrade, H. (1990). English for you. Volk und Wissen.

Cita Chicago (17th ed.)

Schippmann, Annelie, i Horst Schrade. English for You. Berlin: Volk und Wissen, 1990.

Cita MLA (8th ed.)

Schippmann, Annelie, i Horst Schrade. English for You. Volk und Wissen, 1990.