APA (7th ed.) Citation

Ludwig, H., Caffau, E., & Sbordone, L. (2008). Extremely metal-poor stars from the SDSS. Physica scripta, T133, . https://doi.org/10.1088/0031-8949/2008/T133/014037

Chicago Style (17th ed.) Citation

Ludwig, Hans-Günter, Elisabetta Caffau, and Luca Sbordone. "Extremely Metal-poor Stars from the SDSS." Physica Scripta T133 (2008). https://doi.org/10.1088/0031-8949/2008/T133/014037.

MLA (9th ed.) Citation

Ludwig, Hans-Günter, et al. "Extremely Metal-poor Stars from the SDSS." Physica Scripta, vol. T133, 2008, https://doi.org/10.1088/0031-8949/2008/T133/014037.