APA (7th ed.) Citation

Dietrich, M., & Wagner, S. (1994). Monitoring of active galacitc nuclei: 4. The Seyfert 1 galaxy NGC 4593. Astronomy and astrophysics, 284(1), .

Chicago Style (17th ed.) Citation

Dietrich, Matthias, and Stefan Wagner. "Monitoring of Active Galacitc Nuclei: 4. The Seyfert 1 Galaxy NGC 4593." Astronomy and Astrophysics 284, no. 1 (1994).

MLA (9th ed.) Citation

Dietrich, Matthias, and Stefan Wagner. "Monitoring of Active Galacitc Nuclei: 4. The Seyfert 1 Galaxy NGC 4593." Astronomy and Astrophysics, vol. 284, no. 1, 1994.