APA (7th ed.) Citation

Bonifacio, P., Sbordone, L., Caffau, E., & Ludwig, H. (2012). Chemical abundances of distant extremely metal-poor unevolved stars. Astronomy and astrophysics, 542(6), .

Chicago Style (17th ed.) Citation

Bonifacio, Piercarlo, Luca Sbordone, Elisabetta Caffau, and Hans-Günter Ludwig. "Chemical Abundances of Distant Extremely Metal-poor Unevolved Stars." Astronomy and Astrophysics 542, no. 6 (2012).

MLA (9th ed.) Citation

Bonifacio, Piercarlo, et al. "Chemical Abundances of Distant Extremely Metal-poor Unevolved Stars." Astronomy and Astrophysics, vol. 542, no. 6, 2012.