Cite
Excited OH+, H2O+, and H3O+ in NGC 4418 and Arp 220.
MLA
González-Alfonso, E., et al. “Excited OH+, H2O+, and H3O+ in NGC 4418 and Arp 220.” Astronomy & Astrophysics / Astronomie et Astrophysique, vol. 550, Feb. 2013, pp. 1–23. EBSCOhost, https://doi.org/10.1051/0004-6361/201220466.
APA
González-Alfonso, E., Fischer, J., Bruderer, S., P.Müller, H. S., Graciá-Carpio, J., Sturm, E., Lutz, D., Poglitsch, A., Feuchtgruber, H., Veilleux, S., Contursi, A., Sternberg, A., Hailey-Dunsheath, S., Verma, A., Christopher, N., Davies, R., Genzel, R., & Tacconi, L. (2013). Excited OH+, H2O+, and H3O+ in NGC 4418 and Arp 220. Astronomy & Astrophysics / Astronomie et Astrophysique, 550, 1–23. https://doi.org/10.1051/0004-6361/201220466
Chicago
González-Alfonso, E., J. Fischer, S. Bruderer, H. S. P.Müller, J. Graciá-Carpio, E. Sturm, D. Lutz, et al. 2013. “Excited OH+, H2O+, and H3O+ in NGC 4418 and Arp 220.” Astronomy & Astrophysics / Astronomie et Astrophysique 550 (February): 1–23. doi:10.1051/0004-6361/201220466.