APA (7th ed.) Citation

Haardt, F., & Wagner, S. (1998). The hidden X-ray Seyfert nucleus in 3C 273: BeppoSAX results. Astronomy and astrophysics, 340, .

Chicago Style (17th ed.) Citation

Haardt, Francesco, and Stefan Wagner. "The Hidden X-ray Seyfert Nucleus in 3C 273: BeppoSAX Results." Astronomy and Astrophysics 340 (1998).

MLA (9th ed.) Citation

Haardt, Francesco, and Stefan Wagner. "The Hidden X-ray Seyfert Nucleus in 3C 273: BeppoSAX Results." Astronomy and Astrophysics, vol. 340, 1998.

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