APA (7th ed.) Citation

Guhathakurta, P., Reitzel, D. B., & Grebel, E. K. (2000). Keck studies of M31's stellar halo. Arxiv.

Chicago Style (17th ed.) Citation

Guhathakurta, Puragra, David B. Reitzel, and Eva K. Grebel. "Keck Studies of M31's Stellar Halo." Arxiv 2000.

MLA (9th ed.) Citation

Guhathakurta, Puragra, et al. "Keck Studies of M31's Stellar Halo." Arxiv, 2000.