APA (7th ed.) Citation

Appenzeller, I., & Wagner, S. (1991). Forbidden high-ionization lines in QSO spectra. Astronomy and astrophysics, 250(1), .

Chicago Style (17th ed.) Citation

Appenzeller, Immo, and Stefan Wagner. "Forbidden High-ionization Lines in QSO Spectra." Astronomy and Astrophysics 250, no. 1 (1991).

MLA (9th ed.) Citation

Appenzeller, Immo, and Stefan Wagner. "Forbidden High-ionization Lines in QSO Spectra." Astronomy and Astrophysics, vol. 250, no. 1, 1991.

Warning: These citations may not always be 100% accurate.