APA-Zitierstil (7. Ausg.)

Groote, D., Heber, U., & Jordan, S. (1989). Discovery of two bright low-redshift quasars by the Hamburg quasar survey. Astronomy and astrophysics, 223(1/2), .

Chicago-Zitierstil (17. Ausg.)

Groote, Detlef, Ulrich Heber, und Stefan Jordan. "Discovery of Two Bright Low-redshift Quasars by the Hamburg Quasar Survey." Astronomy and Astrophysics 223, no. 1/2 (1989).

MLA-Zitierstil (9. Ausg.)

Groote, Detlef, et al. "Discovery of Two Bright Low-redshift Quasars by the Hamburg Quasar Survey." Astronomy and Astrophysics, vol. 223, no. 1/2, 1989.