Cita APA (7th ed.)

ebrary, Inc, Coulmas, F., & Ehlich, K. (1983). Writing in focus. Mouton.

Cita Chicago (17th ed.)

ebrary, Inc, Florian Coulmas, i Konrad Ehlich. Writing in Focus. Berlin ; New York: Mouton, 1983.

Cita MLA (9th ed.)

ebrary, Inc, et al. Writing in Focus. Mouton, 1983.