Cita APA (7th ed.)

Steiner, B., & Berger, D. (2003). Tools. König.

Cita Chicago (17th ed.)

Steiner, Barbara, i Doris Berger. Tools. Köln: König, 2003.

Cita MLA (8th ed.)

Steiner, Barbara, i Doris Berger. Tools. König, 2003.