APA (7th ed.) Citation

Stahl, O., & Appenzeller, I. (1989). The 12CH^+/13CH^+ ratio toward zeta Oph. Astronomy and astrophysics, 221(2), .

Chicago Style (17th ed.) Citation

Stahl, Otmar, and Immo Appenzeller. "The 12CH^+/13CH^+ Ratio Toward Zeta Oph." Astronomy and Astrophysics 221, no. 2 (1989).

MLA (9th ed.) Citation

Stahl, Otmar, and Immo Appenzeller. "The 12CH^+/13CH^+ Ratio Toward Zeta Oph." Astronomy and Astrophysics, vol. 221, no. 2, 1989.