APA (7th ed.) Citation

C, M., DP, T., S, A., AG, S., & B, W. (2011). How many species are there on Earth and in the ocean? PLoS biology, 9(8), e1001127. https://doi.org/10.1371/journal.pbio.1001127

Chicago Style (17th ed.) Citation

C, Mora, Tittensor DP, Adl S, Simpson AG, and Worm B. "How Many Species Are There on Earth and in the Ocean?" PLoS Biology 9, no. 8 (2011): e1001127. https://doi.org/10.1371/journal.pbio.1001127.

MLA (9th ed.) Citation

C, Mora, et al. "How Many Species Are There on Earth and in the Ocean?" PLoS Biology, vol. 9, no. 8, 2011, p. e1001127, https://doi.org/10.1371/journal.pbio.1001127.