APA-Zitierstil (7. Ausg.)

(1991). Variability of active galaxies: Proceedings of a workshop of the Sonderforschungsbereich 328, held at Heidelberg, Germany 3 - 5 September 1990. Springer.

Chicago-Zitierstil (17. Ausg.)

Variability of Active Galaxies: Proceedings of a Workshop of the Sonderforschungsbereich 328, Held at Heidelberg, Germany 3 - 5 September 1990. Berlin u.a: Springer, 1991.

MLA-Zitierstil (9. Ausg.)

Variability of Active Galaxies: Proceedings of a Workshop of the Sonderforschungsbereich 328, Held at Heidelberg, Germany 3 - 5 September 1990. Springer, 1991.