APA (7th ed.) Citation

Stahl, O., Mandel, H., Szeifert, T., & Wolf, B. (1991). Forbidden emission lines in the spectrum of P Cygni. Astronomy & astrophysics, 244(2), .

Chicago Style (17th ed.) Citation

Stahl, Otmar, Holger Mandel, Thomas Szeifert, and Bernhard Wolf. "Forbidden Emission Lines in the Spectrum of P Cygni." Astronomy & Astrophysics 244, no. 2 (1991).

MLA (9th ed.) Citation

Stahl, Otmar, et al. "Forbidden Emission Lines in the Spectrum of P Cygni." Astronomy & Astrophysics, vol. 244, no. 2, 1991.