APA (7th ed.) Citation

Knapp, K., Siedlhofer, B., & Widdowson, H. (2009). Handbook of foreign language communication and learning (1a. ed.). Walter de Gruyter.

Chicago Style (17th ed.) Citation

Knapp, Karlfried, Barbara Siedlhofer, and Henry Widdowson. Handbook of Foreign Language Communication and Learning. 1a. ed. Berlín: Walter de Gruyter, 2009.

MLA (9th ed.) Citation

Knapp, Karlfried, et al. Handbook of Foreign Language Communication and Learning. 1a. ed. Walter de Gruyter, 2009.