APA (7th ed.) Citation

Harbeck, D., Smith, G. H., & Grebel, E. K. (2003). CN variations on the faint main sequence of 47 Tuc. CNO in the universe.

Chicago Style (17th ed.) Citation

Harbeck, Daniel-Rolf, Graeme H. Smith, and Eva K. Grebel. "CN Variations on the Faint Main Sequence of 47 Tuc." CNO in the Universe 2003.

MLA (9th ed.) Citation

Harbeck, Daniel-Rolf, et al. "CN Variations on the Faint Main Sequence of 47 Tuc." CNO in the Universe, 2003.