Citazione Stile APA (7a Edizione)

Butler, S., Burke, C., Burke, E., & Parker, S. (1999). Kenntnisse: An advanced German course (Student's book, 1. publ.). Routledge.

Citazione stile Chigago Style (17a edizione)

Butler, Sarah, Claire Burke, Edmund Burke, e Susanne Parker. Kenntnisse: An Advanced German Course. Student's book, 1. publ. London New York: Routledge, 1999.

Citatione MLA (9a ed.)

Butler, Sarah, et al. Kenntnisse: An Advanced German Course. Student's book, 1. publ. Routledge, 1999.